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Index Entry  Section

!
!: Connectives for test
!=: String tests

%
%: Numeric expressions
%b: printf invocation
%q: printf invocation

&
&: Relations for expr

*
*: Numeric expressions

+
+: String expressions
+: Numeric expressions
+page_range: pr invocation

-
-: Numeric expressions
-: env invocation
- and Unix rm: rm invocation
-’, removing files beginning with: rm invocation
--: Common options
--across: pr invocation
--additional-suffix: split invocation
--address-radix: od invocation
--adjustment: nice invocation
--all: unexpand invocation
--all: Which files are listed
--all: df invocation
--all: du invocation
--all: stty invocation
--all: who invocation
--all: nproc invocation
--all: uname invocation
--all-repeated: uniq invocation
--almost-all: Which files are listed
--apparent-size: du invocation
--append: tee invocation
--archive: cp invocation
--attributes-only: cp invocation
--author: What information is listed
--auto-reference: Output formatting in ptx
--backup: Backup options
--backup: cp invocation
--backup: install invocation
--backup: mv invocation
--backup: ln invocation
--batch-size: sort invocation
--before: tac invocation
--binary: md5sum invocation
--block-size: Block size
--block-size: df invocation
--block-size: du invocation
--block-size=size: Block size
--body-numbering: nl invocation
--boot: who invocation
--bourne-shell: dircolors invocation
--break-file: Input processing in ptx
--buffer-size: sort invocation
--bytes: fold invocation
--bytes: head invocation
--bytes: tail invocation
--bytes: split invocation
--bytes: wc invocation
--bytes: cut invocation
--bytes: du invocation
--c-shell: dircolors invocation
--canonicalize: readlink invocation
--canonicalize-existing: readlink invocation
--canonicalize-existing: realpath invocation
--canonicalize-missing: readlink invocation
--canonicalize-missing: realpath invocation
--changes: chown invocation
--changes: chgrp invocation
--changes: chmod invocation
--characters: cut invocation
--chars: wc invocation
--check: sort invocation
--check: sort invocation
--check-chars: uniq invocation
--classify: General output formatting
--color: General output formatting
--columns: pr invocation
--compare: install invocation
--complement: cut invocation
--compute: runcon invocation
--context: What information is listed
--context: cp invocation
--context: install invocation
--context: mv invocation
--context: mkdir invocation
--context: mkfifo invocation
--context: mknod invocation
--context: id invocation
--count: uniq invocation
--count: who invocation
--count-links: du invocation
--crown-margin: fmt invocation
--csh: dircolors invocation
--data: sync invocation
--date: touch invocation
--date: Options for date
--dead: who invocation
--debug: numfmt invocation
--decode: base64 invocation
--delimiter: cut invocation
--delimiter: numfmt invocation
--delimiters: paste invocation
--dereference: Which files are listed
--dereference: cp invocation
--dereference: chown invocation
--dereference: chgrp invocation
--dereference: du invocation
--dereference: stat invocation
--dereference: chcon invocation
--dereference-args: du invocation
--dereference-command-line: Which files are listed
--dereference-command-line-symlink-to-dir: Which files are listed
--dictionary-order: sort invocation
--digits: csplit invocation
--dir: rm invocation
--directory: Which files are listed
--directory: install invocation
--directory: ln invocation
--directory: mktemp invocation
--dired: What information is listed
--double-space: pr invocation
--dry-run: mktemp invocation
--echo: shuf invocation
--elide-empty-files: split invocation
--elide-empty-files: csplit invocation
--endian: od invocation
--equal-width: seq invocation
--error: stdbuf invocation
--escape: Formatting the file names
--exact: shred invocation
--exclude-from=file: du invocation
--exclude-type: df invocation
--exclude=pattern: du invocation
--expand-tabs: pr invocation
--field: numfmt invocation
--field-separator: sort invocation
--fields: cut invocation
--file: stty invocation
--file: Options for date
--file-system: stat invocation
--file-system: sync invocation
--file-type: General output formatting
--files0-from=file: wc invocation
--files0-from=file: sort invocation
--files0-from=file: du invocation
--filter: split invocation
--first-line-number: pr invocation
--flag-truncation: Output formatting in ptx
--follow: tail invocation
--footer-numbering: nl invocation
--force: cp invocation
--force: mv invocation
--force: rm invocation
--force: shred invocation
--force: ln invocation
--foreground: timeout invocation
--form-feed: pr invocation
--format: od invocation
--format: What information is listed
--format: General output formatting
--format: General output formatting
--format: General output formatting
--format: General output formatting
--format: numfmt invocation
--format: seq invocation
--format=format: stat invocation
--format=roff: Output formatting in ptx
--format=tex: Output formatting in ptx
--from: chown invocation
--from: numfmt invocation
--from-unit: numfmt invocation
--full-time: What information is listed
--gap-size: Output formatting in ptx
--general-numeric-sort: sort invocation
--goal: fmt invocation
--group: uniq invocation
--group: install invocation
--group: id invocation
--group-directories-first: Which files are listed
--grouping: numfmt invocation
--groups: id invocation
--groups: chroot invocation
--hardware-platform: uname invocation
--head-count: shuf invocation
--header: pr invocation
--header: join invocation
--header: numfmt invocation
--header-numbering: nl invocation
--header=N: numfmt invocation
--heading: who invocation
--help: Common options
--hide-control-chars: Formatting the file names
--hide=pattern: Which files are listed
--human-numeric-sort: sort invocation
--human-readable: Block size
--human-readable: What information is listed
--human-readable: df invocation
--human-readable: du invocation
--ignore: nproc invocation
--ignore-backups: Which files are listed
--ignore-case: sort invocation
--ignore-case: uniq invocation
--ignore-case: Charset selection in ptx
--ignore-case: join invocation
--ignore-environment: env invocation
--ignore-fail-on-non-empty: rmdir invocation
--ignore-file: Input processing in ptx
--ignore-garbage: base64 invocation
--ignore-interrupts: tee invocation
--ignore-leading-blanks: sort invocation
--ignore-missing: md5sum invocation
--ignore-nonprinting: sort invocation
--ignore=pattern: Which files are listed
--indent: pr invocation
--indicator-style: General output formatting
--indicator-style: General output formatting
--indicator-style: General output formatting
--indicator-style: General output formatting
--initial: expand invocation
--inode: What information is listed
--inodes: df invocation
--inodes: du invocation
--input: stdbuf invocation
--input-range: shuf invocation
--interactive: cp invocation
--interactive: mv invocation
--interactive: rm invocation
--interactive: ln invocation
--invalid: numfmt invocation
--io-blocks: truncate invocation
--iso-8601[=timespec]: Options for date
--iterations=number: shred invocation
--join-blank-lines: nl invocation
--join-lines: pr invocation
--keep-files: csplit invocation
--kernel-name: uname invocation
--kernel-release: uname invocation
--kernel-version: uname invocation
--key: sort invocation
--kibibytes: General output formatting
--kill-after: timeout invocation
--length: pr invocation
--line-bytes: split invocation
--line-increment: nl invocation
--lines: head invocation
--lines: tail invocation
--lines: split invocation
--lines: wc invocation
--link: cp invocation
--literal: Formatting the file names
--local: df invocation
--logical: ln invocation
--logical: realpath invocation
--logical: pwd invocation
--login: who invocation
--lookup: who invocation
--machine: uname invocation
--macro-name: Output formatting in ptx
--max-depth=depth: du invocation
--max-line-length: wc invocation
--max-unchanged-stats: tail invocation
--merge: pr invocation
--merge: sort invocation
--mesg: who invocation
--message: who invocation
--mode: install invocation
--mode: mkdir invocation
--mode: mkfifo invocation
--mode: mknod invocation
--month-sort: sort invocation
--multiple: basename invocation
--name: id invocation
--no-clobber: cp invocation
--no-clobber: mv invocation
--no-create: touch invocation
--no-create: truncate invocation
--no-dereference: cp invocation
--no-dereference: ln invocation
--no-dereference: chown invocation
--no-dereference: chgrp invocation
--no-dereference: touch invocation
--no-dereference: du invocation
--no-dereference: chcon invocation
--no-file-warnings: pr invocation
--no-group: What information is listed
--no-newline: readlink invocation
--no-preserve-root: rm invocation
--no-preserve-root: chown invocation
--no-preserve-root: chgrp invocation
--no-preserve-root: chmod invocation
--no-preserve-root: chcon invocation
--no-renumber: nl invocation
--no-symlinks: realpath invocation
--no-sync: df invocation
--no-target-directory: Target directory
--no-target-directory: cp invocation
--no-target-directory: install invocation
--no-target-directory: mv invocation
--no-target-directory: ln invocation
--nodename: uname invocation
--null: du invocation
--null: printenv invocation
--null: env invocation
--number: cat invocation
--number: split invocation
--number-format: nl invocation
--number-lines: pr invocation
--number-nonblank: cat invocation
--number-separator: nl invocation
--number-width: nl invocation
--numeric-sort: sort invocation
--numeric-suffixes: split invocation
--numeric-uid-gid: What information is listed
--omit-header: pr invocation
--omit-pagination: pr invocation
--one-file-system: cp invocation
--one-file-system: rm invocation
--one-file-system: du invocation
--only-delimited: cut invocation
--only-file: Input processing in ptx
--operating-system: uname invocation
--output: sort invocation
--output: shuf invocation
--output: df invocation
--output: stdbuf invocation
--output-delimiter: cut invocation
--output-duplicates: od invocation
--output-error: tee invocation
--output-tabs: pr invocation
--owner: install invocation
--padding: numfmt invocation
--pages=page_range: pr invocation
--page_width: pr invocation
--parallel: sort invocation
--parents: cp invocation
--parents: mkdir invocation
--parents: rmdir invocation
--physical: ln invocation
--physical: realpath invocation
--physical: pwd invocation
--pid: tail invocation
--portability: df invocation
--portability: pathchk invocation
--prefix: csplit invocation
--preserve: cp invocation
--preserve-context: install invocation
--preserve-root: rm invocation
--preserve-root: chown invocation
--preserve-root: chgrp invocation
--preserve-root: chmod invocation
--preserve-root: chcon invocation
--preserve-status: timeout invocation
--preserve-timestamps: install invocation
--print-database: dircolors invocation
--print-type: df invocation
--printf=format: stat invocation
--process: who invocation
--processor: uname invocation
--quiet: head invocation
--quiet: tail invocation
--quiet: csplit invocation
--quiet: md5sum invocation
--quiet: readlink invocation
--quiet: chown invocation
--quiet: chgrp invocation
--quiet: chmod invocation
--quiet: mktemp invocation
--quiet: realpath invocation
--quiet: tty invocation
--quote-name: Formatting the file names
--quoting-style: Formatting the file names
--quoting-style: Formatting the file names
--quoting-style: Formatting the file names
--quoting-style: Formatting the file names
--random-sort: sort invocation
--random-source: sort invocation
--random-source: shuf invocation
--random-source: shred invocation
--range: chcon invocation
--range: runcon invocation
--read-bytes: od invocation
--real: id invocation
--recursive: Which files are listed
--recursive: cp invocation
--recursive: rm invocation
--recursive: chown invocation
--recursive: chgrp invocation
--recursive: chmod invocation
--recursive: chcon invocation
--reference: chown invocation
--reference: chgrp invocation
--reference: chmod invocation
--reference: touch invocation
--reference: truncate invocation
--reference: Options for date
--reference: chcon invocation
--references: Input processing in ptx
--reflink[=when]: cp invocation
--regex: tac invocation
--relative: ln invocation
--relative-base: realpath invocation
--relative-to: realpath invocation
--remove: shred invocation
--remove-destination: cp invocation
--remove=unlink: shred invocation
--remove=wipe: shred invocation
--remove=wipesync: shred invocation
--repeat: shuf invocation
--repeated: uniq invocation
--retry: tail invocation
--reverse: sort invocation
--reverse: Sorting the output
--rfc-2822: Options for date
--rfc-3339=timespec: Options for date
--rfc-822: Options for date
--right-side-refs: Output formatting in ptx
--role: chcon invocation
--role: runcon invocation
--round: numfmt invocation
--round=down: numfmt invocation
--round=from-zero: numfmt invocation
--round=nearest: numfmt invocation
--round=towards-zero: numfmt invocation
--round=up: numfmt invocation
--runlevel: who invocation
--save: stty invocation
--section-delimiter: nl invocation
--sentence-regexp: Input processing in ptx
--sep-string: pr invocation
--separate-dirs: du invocation
--separator: tac invocation
--separator: pr invocation
--separator: split invocation
--separator: seq invocation
--serial: paste invocation
--set: Options for date
--sh: dircolors invocation
--show-all: cat invocation
--show-control-chars: pr invocation
--show-control-chars: Formatting the file names
--show-ends: cat invocation
--show-nonprinting: cat invocation
--show-nonprinting: pr invocation
--show-tabs: cat invocation
--si: Block size
--si: What information is listed
--si: df invocation
--si: du invocation
--signal: timeout invocation
--silent: head invocation
--silent: tail invocation
--silent: csplit invocation
--silent: readlink invocation
--silent: chown invocation
--silent: chgrp invocation
--silent: chmod invocation
--silent: tty invocation
--size: What information is listed
--size: truncate invocation
--size=bytes: shred invocation
--skip-bytes: od invocation
--skip-chars: uniq invocation
--skip-chdir: chroot invocation
--skip-fields: uniq invocation
--sleep-interval: tail invocation
--sort: sort invocation
--sort: sort invocation
--sort: sort invocation
--sort: sort invocation
--sort: sort invocation
--sort: Sorting the output
--sort: Sorting the output
--sort: Sorting the output
--sort: Sorting the output
--sort: Sorting the output
--spaces: fold invocation
--sparse=when: cp invocation
--split-only: fmt invocation
--squeeze-blank: cat invocation
--stable: sort invocation
--starting-line-number: nl invocation
--status: md5sum invocation
--strict: md5sum invocation
--strings: od invocation
--strip: install invocation
--strip: realpath invocation
--strip-program: install invocation
--strip-trailing-slashes: cp invocation
--strip-trailing-slashes: mv invocation
--suffix: Backup options
--suffix: cp invocation
--suffix: install invocation
--suffix: mv invocation
--suffix: ln invocation
--suffix: basename invocation
--suffix: mktemp invocation
--suffix: numfmt invocation
--suffix-format: csplit invocation
--suffix-length: split invocation
--summarize: du invocation
--suppress-matched: csplit invocation
--symbolic: ln invocation
--symbolic-link: cp invocation
--sync: df invocation
--sysv: sum invocation
--tabs: expand invocation
--tabs: unexpand invocation
--tabsize: General output formatting
--tag: md5sum invocation
--tagged-paragraph: fmt invocation
--target-directory: Target directory
--target-directory: cp invocation
--target-directory: install invocation
--target-directory: mv invocation
--target-directory: ln invocation
--temporary-directory: sort invocation
--terse: stat invocation
--text: md5sum invocation
--threshold: du invocation
--time: Sorting the output
--time: Sorting the output
--time: touch invocation
--time: touch invocation
--time: du invocation
--time: du invocation
--time: du invocation
--time: who invocation
--time-style: Formatting file timestamps
--time-style: du invocation
--tmpdir: mktemp invocation
--to: numfmt invocation
--to-unit: numfmt invocation
--total: df invocation
--total: du invocation
--traditional: od invocation
--type: df invocation
--type: chcon invocation
--type: runcon invocation
--unbuffered: split invocation
--uniform-spacing: fmt invocation
--unique: sort invocation
--unique: uniq invocation
--universal: Options for date
--unset: env invocation
--update: cp invocation
--update: mv invocation
--user: id invocation
--user: chcon invocation
--user: runcon invocation
--userspec: chroot invocation
--utc: Options for date
--verbose: head invocation
--verbose: tail invocation
--verbose: split invocation
--verbose: cp invocation
--verbose: install invocation
--verbose: mv invocation
--verbose: rm invocation
--verbose: shred invocation
--verbose: ln invocation
--verbose: mkdir invocation
--verbose: readlink invocation
--verbose: rmdir invocation
--verbose: chown invocation
--verbose: chgrp invocation
--verbose: chmod invocation
--verbose: chcon invocation
--version: Common options
--version-sort: sort invocation
--warn: md5sum invocation
--width: od invocation
--width: fmt invocation
--width: pr invocation
--width: fold invocation
--width: Output formatting in ptx
--width: General output formatting
--word-regexp: Input processing in ptx
--words: wc invocation
--wrap: base64 invocation
--writable: who invocation
--zero: shred invocation
--zero: readlink invocation
--zero: basename invocation
--zero: dirname invocation
--zero: realpath invocation
--zero: id invocation
--zero-terminated: head invocation
--zero-terminated: tail invocation
--zero-terminated: sort invocation
--zero-terminated: shuf invocation
--zero-terminated: uniq invocation
--zero-terminated: comm invocation
--zero-terminated: cut invocation
--zero-terminated: paste invocation
--zero-terminated: join invocation
--zero-terminated: numfmt invocation
-0: du invocation
-0: printenv invocation
-0: env invocation
-1: comm invocation
-1: join invocation
-1: General output formatting
-2: comm invocation
-2: join invocation
-3: comm invocation
-A: cat invocation
-A: od invocation
-a: od invocation
-a: pr invocation
-a: split invocation
-A: Output formatting in ptx
-a: join invocation
-a: unexpand invocation
-a: Which files are listed
-A: Which files are listed
-a: cp invocation
-a: touch invocation
-a: df invocation
-a: du invocation
-a: Connectives for test
-a: tee invocation
-a: basename invocation
-a: stty invocation
-a: who invocation
-a: uname invocation
-b: Backup options
-b: cat invocation
-b: tac invocation
-b: nl invocation
-b: od invocation
-b: fold invocation
-b: split invocation
-b: csplit invocation
-b: md5sum invocation
-b: sort invocation
-b: Input processing in ptx
-b: cut invocation
-B: Which files are listed
-b: Formatting the file names
-b: dircolors invocation
-b: cp invocation
-b: install invocation
-b: mv invocation
-b: ln invocation
-B: df invocation
-B: du invocation
-b: du invocation
-b: File type tests
-b: who invocation
-c: od invocation
-c: fmt invocation
-c: pr invocation
-c: head invocation
-c: tail invocation
-C: split invocation
-c: wc invocation
-c: sort invocation
-c: sort invocation
-c: shuf invocation
-c: uniq invocation
-c: cut invocation
-c: Sorting the output
-C: General output formatting
-c: dircolors invocation
-C: install invocation
-c: install invocation
-c: chown invocation
-c: chgrp invocation
-c: chmod invocation
-c: touch invocation
-c: du invocation
-c: stat invocation
-c: truncate invocation
-c: File type tests
-c: runcon invocation
-column: pr invocation
-d: nl invocation
-d: od invocation
-d: base64 invocation
-d: pr invocation
-d: split invocation
-d: sort invocation
-d: uniq invocation
-D: uniq invocation
-d: cut invocation
-d: paste invocation
-d: Which files are listed
-D: What information is listed
-d: cp invocation
-D: install invocation
-d: install invocation
-d: rm invocation
-d: ln invocation
-d: touch invocation
-D: du invocation
-d: File type tests
-d: mktemp invocation
-d: who invocation
-d: Options for date
-d: numfmt invocation
-d depth: du invocation
-e: cat invocation
-E: cat invocation
-e: pr invocation
-e: split invocation
-e: join invocation
-e: readlink invocation
-e: echo invocation
-E: echo invocation
-e: File characteristic tests
-e: realpath invocation
-e: stdbuf invocation
-ef: File characteristic tests
-eq: Numeric tests
-f: nl invocation
-f: od invocation
-F: pr invocation
-f: pr invocation
-f: tail invocation
-F: tail invocation
-f: csplit invocation
-f: sort invocation
-f: uniq invocation
-f: Charset selection in ptx
-F: Output formatting in ptx
-f: cut invocation
-f: Sorting the output
-F: General output formatting
-f: cp invocation
-f: mv invocation
-f: rm invocation
-f: shred invocation
-F: ln invocation
-f: ln invocation
-f: readlink invocation
-f: chown invocation
-f: chgrp invocation
-f: chmod invocation
-f: touch invocation
-f: stat invocation
-f: File type tests
-F: stty invocation
-f: Options for date
-f: seq invocation
-g: fmt invocation
-g: sort invocation
-g: Output formatting in ptx
-g: What information is listed
-G: What information is listed
-g: install invocation
-g: Access permission tests
-G: Access permission tests
-g: stty invocation
-g: id invocation
-G: id invocation
-ge: Numeric tests
-gt: Numeric tests
-h: Block size
-H: Traversing symlinks
-h: nl invocation
-h: pr invocation
-h: sort invocation
-H: Which files are listed
-h: What information is listed
-H: cp invocation
-h: chown invocation
-H: chown invocation
-h: chgrp invocation
-H: chgrp invocation
-h: touch invocation
-h: df invocation
-H: df invocation
-H: du invocation
-h: du invocation
-h: File type tests
-H: who invocation
-h: chcon invocation
-H: chcon invocation
-i: nl invocation
-i: od invocation
-i: base64 invocation
-i: pr invocation
-i: sort invocation
-i: shuf invocation
-i: uniq invocation
-i: Input processing in ptx
-i: join invocation
-i: expand invocation
-I: Which files are listed
-i: What information is listed
-i: cp invocation
-i: mv invocation
-i: rm invocation
-I: rm invocation
-i: ln invocation
-i: df invocation
-i: tee invocation
-i: uname invocation
-i: env invocation
-i: stdbuf invocation
-I[timespec]: Options for date
-j: od invocation
-J: pr invocation
-k: Block size
-k: csplit invocation
-k: sort invocation
-k: General output formatting
-k: df invocation
-k: du invocation
-k: Access permission tests
-k: timeout invocation
-L: Traversing symlinks
-l: nl invocation
-l: od invocation
-l: pr invocation
-l: split invocation
-l: wc invocation
-L: wc invocation
-L: Which files are listed
-l: What information is listed
-l: cp invocation
-L: cp invocation
-L: ln invocation
-L: chown invocation
-L: chgrp invocation
-l: df invocation
-L: du invocation
-l: du invocation
-L: stat invocation
-L: File type tests
-L: realpath invocation
-L: pwd invocation
-l: who invocation
-L: chcon invocation
-l: chcon invocation
-l: runcon invocation
-le: Numeric tests
-lt: Numeric tests
-m: pr invocation
-m: wc invocation
-m: sort invocation
-M: sort invocation
-M: Output formatting in ptx
-m: General output formatting
-m: install invocation
-m: mkdir invocation
-m: mkfifo invocation
-m: mknod invocation
-m: readlink invocation
-m: touch invocation
-m: du invocation
-m: realpath invocation
-m: who invocation
-m: uname invocation
-n: cat invocation
-n: nl invocation
-N: od invocation
-n: pr invocation
-N: pr invocation
-n: head invocation
-n: tail invocation
-n: split invocation
-n: csplit invocation
-n: sort invocation
-n: shuf invocation
-n: cut invocation
-n: What information is listed
-N: Formatting the file names
-n: cp invocation
-n: mv invocation
-n: ln invocation
-n: readlink invocation
-n: echo invocation
-n: String tests
-n: id invocation
-n: uname invocation
-n: nice invocation
-n number: shred invocation
-ne: Numeric tests
-nt: File characteristic tests
-o: od invocation
-o: pr invocation
-o: sort invocation
-o: shuf invocation
-o: Input processing in ptx
-O: Output formatting in ptx
-o: What information is listed
-o: install invocation
-o: truncate invocation
-O: Access permission tests
-o: Connectives for test
-o: uname invocation
-o: stdbuf invocation
-ot: File characteristic tests
-P: Traversing symlinks
-p: nl invocation
-p: General output formatting
-p: dircolors invocation
-P: cp invocation
-p: cp invocation
-p: install invocation
-P: ln invocation
-p: mkdir invocation
-p: rmdir invocation
-P: chown invocation
-P: chgrp invocation
-P: df invocation
-P: du invocation
-p: File type tests
-p: tee invocation
-p: pathchk invocation
-P: pathchk invocation
-p: mktemp invocation
-P: realpath invocation
-P: pwd invocation
-p: who invocation
-p: uname invocation
-P: chcon invocation
-q: head invocation
-q: tail invocation
-q: csplit invocation
-q: Formatting the file names
-Q: Formatting the file names
-q: readlink invocation
-q: mktemp invocation
-q: realpath invocation
-q: who invocation
-r: tac invocation
-r: pr invocation
-r: sum invocation
-r: sort invocation
-R: sort invocation
-r: shuf invocation
-r: Input processing in ptx
-R: Output formatting in ptx
-R: Which files are listed
-r: Sorting the output
-R: cp invocation
-r: cp invocation
-r: rm invocation
-R: rm invocation
-r: ln invocation
-R: chown invocation
-R: chgrp invocation
-R: chmod invocation
-r: touch invocation
-r: truncate invocation
-r: Access permission tests
-r: id invocation
-r: who invocation
-r: Options for date
-R: Options for date
-r: uname invocation
-R: chcon invocation
-r: chcon invocation
-r: runcon invocation
-S: Backup options
-s: cat invocation
-s: tac invocation
-s: nl invocation
-S: od invocation
-s: od invocation
-s: fmt invocation
-s: pr invocation
-S: pr invocation
-s: fold invocation
-s: tail invocation
-s: csplit invocation
-s: sum invocation
-s: sort invocation
-S: sort invocation
-s: uniq invocation
-S: Input processing in ptx
-s: cut invocation
-s: paste invocation
-s: What information is listed
-S: Sorting the output
-s: cp invocation
-S: cp invocation
-s: install invocation
-S: install invocation
-S: mv invocation
-s: ln invocation
-S: ln invocation
-s: readlink invocation
-S: du invocation
-s: du invocation
-s: truncate invocation
-S: File type tests
-s: File characteristic tests
-s: basename invocation
-s: realpath invocation
-s: tty invocation
-s: who invocation
-s: Options for date
-s: uname invocation
-s: timeout invocation
-s: seq invocation
-s bytes: shred invocation
-t: cat invocation
-T: cat invocation
-t: od invocation
-t: fmt invocation
-t: pr invocation
-T: pr invocation
-t: split invocation
-t: md5sum invocation
-t: sort invocation
-T: sort invocation
-T: Output formatting in ptx
-t: expand invocation
-t: unexpand invocation
-t: Sorting the output
-T: General output formatting
-t: cp invocation
-T: cp invocation
-t: install invocation
-T: install invocation
-t: mv invocation
-T: mv invocation
-t: ln invocation
-T: ln invocation
-t: df invocation
-T: df invocation
-t: du invocation
-t: stat invocation
-t: File type tests
-t: mktemp invocation
-t: who invocation
-T: who invocation
-t: chcon invocation
-t: runcon invocation
-u: cat invocation
-u: fmt invocation
-u: split invocation
-u: sort invocation
-u: uniq invocation
-u: Sorting the output
-U: Sorting the output
-u: cp invocation
-u: mv invocation
-u: shred invocation
-u: Access permission tests
-u: mktemp invocation
-u: id invocation
-u: who invocation
-u: Options for date
-u: chcon invocation
-u: runcon invocation
-u: env invocation
-v: cat invocation
-v: nl invocation
-v: od invocation
-v: pr invocation
-v: head invocation
-v: tail invocation
-V: sort invocation
-v: Sorting the output
-v: cp invocation
-v: install invocation
-v: mv invocation
-v: rm invocation
-v: shred invocation
-v: ln invocation
-v: mkdir invocation
-v: readlink invocation
-v: rmdir invocation
-v: chown invocation
-v: chgrp invocation
-v: chmod invocation
-v: uname invocation
-v: chcon invocation
-w: nl invocation
-w: od invocation
-w: base64 invocation
-w: fmt invocation
-w: pr invocation
-W: pr invocation
-w: fold invocation
-w: wc invocation
-w: md5sum invocation
-w: uniq invocation
-W: Input processing in ptx
-w: Output formatting in ptx
-w: General output formatting
-w: Access permission tests
-w: who invocation
-w: seq invocation
-width: fmt invocation
-x: od invocation
-X: Sorting the output
-x: General output formatting
-x: cp invocation
-x: shred invocation
-x: df invocation
-x: du invocation
-x: Access permission tests
-X file: du invocation
-z: head invocation
-z: tail invocation
-z: csplit invocation
-z: sort invocation
-z: shuf invocation
-z: uniq invocation
-z: comm invocation
-z: cut invocation
-z: paste invocation
-z: join invocation
-Z: What information is listed
-Z: cp invocation
-Z: install invocation
-Z: mv invocation
-z: shred invocation
-Z: mkdir invocation
-Z: mkfifo invocation
-Z: mknod invocation
-z: readlink invocation
-z: String tests
-z: basename invocation
-z: dirname invocation
-z: realpath invocation
-Z: id invocation
-z: id invocation
-z: numfmt invocation

/
/: Numeric expressions

1
128-bit checksum: md5sum invocation
16-bit checksum: sum invocation
160-bit checksum: sha1sum invocation

2
224-bit checksum: sha2 utilities
256-bit checksum: sha2 utilities

3
384-bit checksum: sha2 utilities

5
512-bit checksum: sha2 utilities

<
<: Relations for expr
<=: Relations for expr

=
=: Relations for expr
=: String tests
==: Relations for expr
==: String tests

>
>: Relations for expr
>=: Relations for expr

\
\( regexp operator: String expressions
\+ regexp operator: String expressions
\? regexp operator: String expressions
\c: printf invocation
\ooo: printf invocation
\uhhhh: printf invocation
\Uhhhhhhhh: printf invocation
\xhh: printf invocation
\| regexp operator: String expressions

_
_POSIX2_VERSION: Standards conformance
_POSIX2_VERSION: tail invocation
_POSIX2_VERSION: sort invocation
_POSIX2_VERSION: uniq invocation
_POSIX2_VERSION: touch invocation

|
|: Relations for expr

A
abbreviations for months: Calendar date items
access permission tests: Access permission tests
access permissions, changing: chmod invocation
access time: dd invocation
access time, changing: touch invocation
access time, printing or sorting files by: Sorting the output
access time, show the most recent: du invocation
across columns: pr invocation
across, listing files: General output formatting
adding permissions: Setting Permissions
addition: Numeric expressions
ago in date strings: Relative items in date strings
all lines, grouping: uniq invocation
all repeated lines, outputting: uniq invocation
alnum: Character sets
alpha: Character sets
alternate ebcdic, converting to: dd invocation
always color option: General output formatting
always interactive option: rm invocation
am i: who invocation
am in date strings: Time of day items
and operator: Connectives for test
and operator: Relations for expr
append: dd invocation
appending to the output file: dd invocation
appropriate privileges: install invocation
appropriate privileges: Setting the time
appropriate privileges: hostname invocation
appropriate privileges: nice invocation
arbitrary date strings, parsing: Options for date
arbitrary text, displaying: echo invocation
arch: arch invocation
arithmetic tests: Numeric tests
ASCII dump of files: od invocation
ascii, converting to: dd invocation
atime, changing: touch invocation
atime, printing or sorting files by: Sorting the output
atime, show the most recent: du invocation
attributes, file: Changing file attributes
authors of parse_datetime: Authors of parse_datetime
auto color option: General output formatting

B
b for block special file: mknod invocation
background jobs, stopping at terminal write: Local
backslash escapes: Character sets
backslash escapes: echo invocation
backslash escapes: echo invocation
backslash sequences for file names: Formatting the file names
backup files, ignoring: Which files are listed
backup options: Backup options
backup suffix: Backup options
backups, making: Backup options
backups, making: cp invocation
backups, making: install invocation
backups, making: mv invocation
backups, making: ln invocation
backups, making only: cp invocation
base32: base32 invocation
base32 encoding: base32 invocation
base64: base64 invocation
Base64 decoding: base64 invocation
base64 encoding: base64 invocation
basename: basename invocation
baud rate, setting: Special
beeping at input buffer full: Input
beginning of time: Time conversion specifiers
beginning of time, for POSIX: Seconds since the Epoch
Bellovin, Steven M.: Authors of parse_datetime
Berets, Jim: Authors of parse_datetime
Berry, K.: Introduction
Berry, K.: Authors of parse_datetime
binary: dd invocation
binary I/O: dd invocation
binary input files: md5sum invocation
bind mount: rm invocation
bind mount: stat invocation
blank: Character sets
blank lines, numbering: nl invocation
blanks, ignoring leading: sort invocation
block (space-padding): dd invocation
block size: Block size
block size: dd invocation
block size of conversion: dd invocation
block size of input: dd invocation
block size of output: dd invocation
block special check: File type tests
block special files: mknod invocation
block special files, creating: mknod invocation
BLOCKSIZE: Block size
BLOCK_SIZE: Block size
body, numbering: nl invocation
Bourne shell syntax for color setup: dircolors invocation
breaks, cause interrupts: Input
breaks, ignoring: Input
brkint: Input
bs: dd invocation
BSD output: md5sum invocation
BSD sum: sum invocation
BSD tail: tail invocation
BSD touch compatibility: touch invocation
bsn: Output
btrfs file system type: df invocation
bugs, reporting: Introduction
built-in shell commands, conflicts with: mknod invocation
built-in shell commands, conflicts with: stat invocation
built-in shell commands, conflicts with: echo invocation
built-in shell commands, conflicts with: printf invocation
built-in shell commands, conflicts with: test invocation
built-in shell commands, conflicts with: pwd invocation
built-in shell commands, conflicts with: nice invocation
built-in shell commands, conflicts with: kill invocation
built-in shell commands, conflicts with: sleep invocation
byte count: wc invocation
byte-swapping: od invocation
byte-swapping: dd invocation

C
c for character special file: mknod invocation
C shell syntax for color setup: dircolors invocation
C-s/C-q flow control: Input
calendar date item: Calendar date items
calling combined multi-call program: Multi-call invocation
canonical file name: readlink invocation
canonical file name: realpath invocation
canonicalize a file name: readlink invocation
canonicalize a file name: realpath invocation
case folding: sort invocation
case translation: Local
case, ignored in dates: General date syntax
cat: cat invocation
cbreak: Combination
cbs: dd invocation
CD-ROM file system type: df invocation
cdfs file system type: df invocation
cdtrdsr: Control
change or print terminal settings: stty invocation
change SELinux context: chcon invocation
changed files, verbosely describing: chgrp invocation
changed owners, verbosely describing: chown invocation
changing access permissions: chmod invocation
changing file attributes: Changing file attributes
changing file ownership: chown invocation
changing file timestamps: touch invocation
changing group ownership: chown invocation
changing group ownership: chgrp invocation
changing security context: chcon invocation
changing special mode bits: Changing Special Mode Bits
character classes: Character sets
character count: wc invocation
character size: Control
character special check: File type tests
character special files: mknod invocation
character special files, creating: mknod invocation
characters, special: Characters
chcon: chcon invocation
check file types: test invocation
checking for sortedness: sort invocation
checking for sortedness: sort invocation
checksum, 128-bit: md5sum invocation
checksum, 16-bit: sum invocation
checksum, 160-bit: sha1sum invocation
checksum, 224-bit: sha2 utilities
checksum, 256-bit: sha2 utilities
checksum, 384-bit: sha2 utilities
checksum, 512-bit: sha2 utilities
chgrp: chgrp invocation
chmod: chmod invocation
chown: chown invocation
chroot: chroot invocation
cio: dd invocation
cksum: cksum invocation
clocal: Control
clock skew: Formatting file timestamps
clock skew: touch invocation
clone: cp invocation
cmspar: Control
cntrl: Character sets
color database, printing: dircolors invocation
color setup: dircolors invocation
color, distinguishing file types with: General output formatting
cols: Special
column to wrap data after: base64 invocation
COLUMNS: General output formatting
COLUMNS: Special
columns: Special
combination settings: Combination
combined: Multi-call invocation
combined date and time of day item: Combined date and time of day items
comm: comm invocation
command-line operands to shuffle: shuf invocation
commands for controlling processes: Process control
commands for delaying: Delaying
commands for exit status: Conditions
commands for file name manipulation: File name manipulation
commands for invoking other commands: Modified command invocation
commands for printing text: Printing text
commands for printing the working context: Working context
commands for printing user information: User information
commands for redirection: Redirection
commands for SELinux context: SELinux context
commands for system context: System context
commas, outputting between files: General output formatting
comments, in dates: General date syntax
common field, joining on: join invocation
common lines: comm invocation
common options: Common options
compare values: test invocation
comparing sorted files: comm invocation
comparison operators: Relations for expr
concatenate and write files: cat invocation
concurrent I/O: dd invocation
conditional executability: Conditional Executability
conditions: Conditions
conflicts with shell built-ins: mknod invocation
conflicts with shell built-ins: stat invocation
conflicts with shell built-ins: echo invocation
conflicts with shell built-ins: printf invocation
conflicts with shell built-ins: test invocation
conflicts with shell built-ins: pwd invocation
conflicts with shell built-ins: nice invocation
conflicts with shell built-ins: kill invocation
conflicts with shell built-ins: sleep invocation
connectives, logical: Connectives for test
connectives, logical: Relations for expr
constant parity: Control
context splitting: csplit invocation
context, system: System context
control characters, using ‘^c: Local
control settings: Control
controlling terminal: dd invocation
conv: dd invocation
conversion block size: dd invocation
conversion specifiers, date: Date conversion specifiers
conversion specifiers, literal: Literal conversion specifiers
conversion specifiers, time: Time conversion specifiers
converting tabs to spaces: expand invocation
converting while copying a file: dd invocation
cooked: Combination
Coordinated Universal Time: Options for date
copy on write: cp invocation
copying directories recursively: cp invocation
copying directories recursively: cp invocation
copying existing permissions: Copying Permissions
copying files: cat invocation
copying files and directories: cp invocation
copying files and setting attributes: install invocation
core utilities: Top
count: dd invocation
count_bytes: dd invocation
COW: cp invocation
cp: cp invocation
crashes and corruption: sync invocation
CRC checksum: cksum invocation
cread: Control
creating directories: mkdir invocation
creating FIFOs (named pipes): mkfifo invocation
creating links (hard only): link invocation
creating links (hard or soft): ln invocation
creating output file, avoiding: dd invocation
creating output file, requiring: dd invocation
crn: Output
crown margin: fmt invocation
crt: Combination
crterase: Local
crtkill: Local
crtscts: Control
csh syntax for color setup: dircolors invocation
csn: Control
csplit: csplit invocation
cstopb: Control
ctime, printing or sorting by: Sorting the output
ctime, show the most recent: du invocation
ctlecho: Local
current working directory, printing: pwd invocation
cut: cut invocation
cyclic redundancy check: cksum invocation

D
data, erasing: shred invocation
database for color setup, printing: dircolors invocation
date: date invocation
date and time of day format, ISO 8601: Combined date and time of day items
date conversion specifiers: Date conversion specifiers
date format, ISO 8601: Calendar date items
date input formats: Date input formats
date options: Options for date
date strings, parsing: Options for date
day in date strings: Relative items in date strings
day in date strings: Relative items in date strings
day of week item: Day of week items
dd: dd invocation
ddrescue: dd invocation
dec: Combination
decctlq: Combination
Decode base64 data: base64 invocation
delay for a specified time: sleep invocation
delaying commands: Delaying
deleting characters: Squeezing and deleting
dereferencing symbolic links: ln invocation
descriptor follow option: tail invocation
destination directory: Target directory
destination directory: Target directory
destination directory: cp invocation
destination directory: cp invocation
destination directory: install invocation
destination directory: install invocation
destination directory: mv invocation
destination directory: mv invocation
destination directory: ln invocation
destination directory: ln invocation
destinations, multiple output: tee invocation
device file, disk: df invocation
df: df invocation
DF_BLOCK_SIZE: Block size
diagnostic: chcon invocation
dictionary order: sort invocation
differing lines: comm invocation
digit: Character sets
dir: dir invocation
dircolors: dircolors invocation
direct: dd invocation
direct I/O: dd invocation
directories, copying: cp invocation
directories, copying recursively: cp invocation
directories, copying recursively: cp invocation
directories, creating: mkdir invocation
directories, creating with given attributes: install invocation
directories, removing: rm invocation
directories, removing (recursively): rm invocation
directories, removing empty: rmdir invocation
directory: dd invocation
directory check: File type tests
directory components, printing: dirname invocation
directory deletion, ignoring failures: rmdir invocation
directory deletion, reporting: rmdir invocation
directory I/O: dd invocation
directory listing: ls invocation
directory listing, brief: dir invocation
directory listing, recursive: Which files are listed
directory listing, verbose: vdir invocation
directory order, listing by: Sorting the output
directory, creating temporary: mktemp invocation
directory, stripping from file names: basename invocation
dired Emacs mode support: What information is listed
dirname: dirname invocation
disabling special characters: Characters
disambiguating group names and IDs: Disambiguating names and IDs
discard: Characters
discarding file cache: dd invocation
disk allocation: What information is listed
disk device file: df invocation
disk usage: Disk usage
disk usage by file system: df invocation
disk usage for files: du invocation
disks, failing: dd invocation
displacement of dates: Relative items in date strings
displaying text: echo invocation
displaying value of a symbolic link: readlink invocation
division: Numeric expressions
do nothing, successfully: true invocation
do nothing, unsuccessfully: false invocation
DOS file system: df invocation
double spacing: pr invocation
down columns: pr invocation
drain: Special
dsusp: Characters
dsync: dd invocation
DTR/DSR flow control: Control
du: du invocation
DU_BLOCK_SIZE: Block size
DVD file system type: df invocation

E
ebcdic, converting to: dd invocation
echo: echo invocation
echo: Local
echoctl: Local
echoe: Local
echok: Local
echoke: Local
echonl: Local
echoprt: Local
effective user and group IDs, printing: id invocation
effective user ID, printing: whoami invocation
Eggert, Paul: Authors of parse_datetime
eight-bit characters: Control
eight-bit characters: Combination
eight-bit input: Input
ek: Combination
empty files, creating: touch invocation
empty lines, numbering: nl invocation
endianness: od invocation
entire files, output of: Output of entire files
env: env invocation
environment variables, printing: printenv invocation
environment, printing: env invocation
environment, running a program in a modified: env invocation
eof: Characters
eol: Characters
eol2: Characters
epoch, for POSIX: Seconds since the Epoch
epoch, seconds since: Time conversion specifiers
equal string check: String tests
equal string check: String tests
equivalence classes: Character sets
erase: Characters
erasing data: shred invocation
error messages, omitting: chown invocation
error messages, omitting: chgrp invocation
error messages, omitting: chmod invocation
evaluation of expressions: expr invocation
even parity: Control
evenp: Combination
exabyte, definition of: Block size
examples of date: Examples of date
examples of expr: Examples of expr
exbibyte, definition of: Block size
excl: dd invocation
excluding files from du: du invocation
excluding files from du: du invocation
executable file check: Access permission tests
executables and file type, marking: General output formatting
execute/search permission: Mode Structure
execute/search permission, symbolic: Setting Permissions
existence-of-file check: File characteristic tests
existing backup method: Backup options
exit status commands: Conditions
exit status of chroot: chroot invocation
exit status of env: env invocation
exit status of expr: expr invocation
exit status of false: false invocation
exit status of ls: ls invocation
exit status of mktemp: mktemp invocation
exit status of nice: nice invocation
exit status of nohup: nohup invocation
exit status of pathchk: pathchk invocation
exit status of printenv: printenv invocation
exit status of realpath: realpath invocation
exit status of runcon: runcon invocation
exit status of sort: sort invocation
exit status of stdbuf: stdbuf invocation
exit status of test: test invocation
exit status of timeout: timeout invocation
exit status of true: true invocation
exit status of tty: tty invocation
expand: expand invocation
expr: expr invocation
expression evaluation: test invocation
expression evaluation: expr invocation
expressions, numeric: Numeric expressions
expressions, string: String expressions
ext2 file system type: df invocation
ext3 file system type: df invocation
ext4 file system type: df invocation
extended attributes, xattr: install invocation
extended attributes, xattr: mv invocation
extension, sorting files by: Sorting the output
extproc: Local

F
factor: factor invocation
failure exit status: false invocation
false: false invocation
fat file system file: df invocation
fdatasync: dd invocation
ffn: Output
field separator character: sort invocation
fields, padding numeric: Padding and other flags
FIFOs, creating: mkfifo invocation
file attributes, changing: Changing file attributes
file characteristic tests: File characteristic tests
file contents, dumping unambiguously: od invocation
file information, preserving: cp invocation
file information, preserving, extended attributes, xattr: cp invocation
file mode bits, numeric: Numeric Modes
file name manipulation: File name manipulation
file names, canonicalization: realpath invocation
file names, checking validity and portability: pathchk invocation
file names, creating temporary: mktemp invocation
file names, stripping directory and suffix: basename invocation
file offset radix: od invocation
file ownership, changing: chown invocation
file sizes: du invocation
file space usage: du invocation
file status: stat invocation
file system disk usage: df invocation
file system sizes: df invocation
file system space, retrieving current data more slowly: df invocation
file system space, retrieving old data more quickly: df invocation
file system status: stat invocation
file system types, limiting output to certain: df invocation
file system types, limiting output to certain: df invocation
file system types, printing: df invocation
file systems: stat invocation
file systems and hard links: ln invocation
file systems, omitting copying to different: cp invocation
file timestamp resolution: touch invocation
file timestamps, changing: touch invocation
file type and executables, marking: General output formatting
file type tests: File type tests
file type, marking: General output formatting
file type, marking: General output formatting
file types: Special file types
file types, special: Special file types
file utilities: Top
files beginning with ‘-’, removing: rm invocation
files, copying: cp invocation
files, creating: truncate invocation
fingerprint, 128-bit: md5sum invocation
fingerprint, 160-bit: sha1sum invocation
fingerprint, 224-bit: sha2 utilities
fingerprint, 256-bit: sha2 utilities
fingerprint, 384-bit: sha2 utilities
fingerprint, 512-bit: sha2 utilities
first in date strings: General date syntax
first part of files, outputting: head invocation
fixed-length records, converting to variable-length: dd invocation
floating point: Floating point
flow control, hardware: Control
flow control, hardware: Control
flow control, software: Input
flush: Characters
flushing, disabling: Local
flusho: Local
fmt: fmt invocation
fold: fold invocation
folding long input lines: fold invocation
footers, numbering: nl invocation
force deletion: shred invocation
formatting file contents: Formatting file contents
formatting of numbers in seq: seq invocation
formatting times: pr invocation
formatting times: date invocation
fortnight in date strings: Relative items in date strings
fsync: dd invocation
fullblock: dd invocation

G
general date syntax: General date syntax
general numeric sort: sort invocation
gibibyte, definition of: Block size
gigabyte, definition of: Block size
giving away permissions: Umask and Protection
GMT: Options for date
grand total of disk size, usage and available space: df invocation
grand total of disk space: du invocation
graph: Character sets
Greenwich Mean Time: Options for date
group IDs, disambiguating: Disambiguating names and IDs
group names, disambiguating: Disambiguating names and IDs
group owner, default: Mode Structure
group ownership of installed files, setting: install invocation
group ownership, changing: chown invocation
group ownership, changing: chgrp invocation
group, permissions for: Setting Permissions
groups: groups invocation
growing files: tail invocation

H
hangups, immunity to: nohup invocation
hard link check: File characteristic tests
hard link, defined: ln invocation
hard links: dd invocation
hard links to directories: ln invocation
hard links to symbolic links: ln invocation
hard links, counting in du: du invocation
hard links, creating: link invocation
hard links, creating: ln invocation
hard links, preserving: cp invocation
hardware class: uname invocation
hardware flow control: Control
hardware flow control: Control
hardware platform: uname invocation
hardware type: uname invocation
hat notation for control characters: Local
head: head invocation
head of output: shuf invocation
headers, numbering: nl invocation
help, online: Common options
hex dump of files: od invocation
holes, copying files with: cp invocation
holes, creating files with: truncate invocation
horizontal, listing files: General output formatting
host processor type: uname invocation
hostid: hostid invocation
hostname: hostname invocation
hostname: uname invocation
hour in date strings: Relative items in date strings
human numeric sort: sort invocation
human-readable output: Block size
human-readable output: What information is listed
human-readable output: df invocation
human-readable output: du invocation
hup[cl]: Control
hurd, author, printing: What information is listed

I
ibs: dd invocation
icanon: Local
icrnl: Input
id: id invocation
idle time: who invocation
IEEE floating point: Floating point
iexten: Local
if: dd invocation
iflag: dd invocation
ignbrk: Input
igncr: Input
ignore file systems: df invocation
Ignore garbage in base64 stream: base64 invocation
ignoring case: sort invocation
ignpar: Input
imaxbel: Input
immunity to hangups: nohup invocation
implementation, hardware: uname invocation
indenting lines: pr invocation
index: String expressions
information, about current users: who invocation
initial part of files, outputting: head invocation
initial tabs, converting: expand invocation
inlcr: Input
inode number, printing: What information is listed
inode usage: df invocation
inode usage, dereferencing in du: du invocation
inode, and hard links: ln invocation
inodes, written buffered: sync invocation
inpck: Input
input block size: dd invocation
input encoding, UTF-8: Input
input range to shuffle: shuf invocation
input settings: Input
input tabs: pr invocation
install: install invocation
intr: Characters
invocation of commands, modified: Modified command invocation
isig: Local
ISO 8601 date and time of day format: Combined date and time of day items
ISO 8601 date format: Calendar date items
ISO/IEC 10646: printf invocation
ISO9660 file system type: df invocation
iso9660 file system type: df invocation
ispeed: Special
istrip: Input
items in date strings: General date syntax
iterations, selecting the number of: shred invocation
iuclc: Input
iutf8: Input
ixany: Input
ixoff: Input
ixon: Input

J
join: join invocation

K
kernel name: uname invocation
kernel release: uname invocation
kernel version: uname invocation
kibibyte, definition of: Block size
kibibytes for file sizes: du invocation
kibibytes for file system sizes: df invocation
kill: kill invocation
kill: Characters
kilobyte, definition of: Block size
Knuth, Donald E.: fmt invocation

L
language, in dates: General date syntax
language, in dates: General date syntax
last day: Day of week items
last day: Options for date
last in date strings: General date syntax
last modified dates, displaying in du: du invocation
last part of files, outputting: tail invocation
lcase: Combination
LCASE: Combination
lcase, converting to: dd invocation
lchown: chown invocation
lchown: chown invocation
lchown: chgrp invocation
lchown: chgrp invocation
LC_ALL: sort invocation
LC_ALL: ls invocation
LC_COLLATE: sort invocation
LC_COLLATE: uniq invocation
LC_COLLATE: comm invocation
LC_COLLATE: join invocation
LC_COLLATE: Relations for expr
LC_CTYPE: sort invocation
LC_CTYPE: sort invocation
LC_CTYPE: sort invocation
LC_CTYPE: sort invocation
LC_CTYPE: printf invocation
LC_MESSAGES: pr invocation
LC_NUMERIC: Block size
LC_NUMERIC: Floating point
LC_NUMERIC: sort invocation
LC_NUMERIC: sort invocation
LC_NUMERIC: sort invocation
LC_NUMERIC: printf invocation
LC_TIME: pr invocation
LC_TIME: sort invocation
LC_TIME: Formatting file timestamps
LC_TIME: Formatting file timestamps
LC_TIME: Formatting file timestamps
LC_TIME: du invocation
LC_TIME: date invocation
leading directories, creating missing: install invocation
leading directory components, stripping: basename invocation
leap seconds: touch invocation
leap seconds: Time conversion specifiers
leap seconds: Time conversion specifiers
leap seconds: Options for date
leap seconds: Examples of date
leap seconds: General date syntax
leap seconds: Time of day items
leap seconds: Seconds since the Epoch
left margin: pr invocation
length: String expressions
limiting output of du: du invocation
line: Special
line buffered: stdbuf invocation
line count: wc invocation
line numbering: nl invocation
line separator character: split invocation
line settings of terminal: stty invocation
line-breaking: fmt invocation
line-by-line comparison: comm invocation
LINES: Special
link: link invocation
links, creating: link invocation
links, creating: ln invocation
Linux file system types: df invocation
literal conversion specifiers: Literal conversion specifiers
litout: Combination
ln: ln invocation
ln format for nl: nl invocation
lnext: Characters
local file system types: df invocation
local settings: Local
logging out and continuing to run: nohup invocation
logical and operator: Connectives for test
logical and operator: Relations for expr
logical connectives: Connectives for test
logical connectives: Relations for expr
logical or operator: Connectives for test
logical or operator: Relations for expr
logical pages, numbering on: nl invocation
login name, printing: logname invocation
login sessions, printing users with: users invocation
login time: who invocation
logname: logname invocation
long ls format: What information is listed
lower: Character sets
lowercase, translating to output: Output
ls: ls invocation
LS_BLOCK_SIZE: Block size
LS_COLORS: General output formatting
LS_COLORS: dircolors invocation
lutimes: touch invocation

M
machine type: uname invocation
machine-readable stty output: stty invocation
MacKenzie, D.: Introduction
MacKenzie, David: Authors of parse_datetime
Makefiles, installing programs in: install invocation
manipulating files: Basic operations
manipulation of file names: File name manipulation
mark parity: Control
match: String expressions
matching patterns: String expressions
MD5: md5sum invocation
md5sum: md5sum invocation
mebibyte, definition of: Block size
mebibytes for file sizes: du invocation
megabyte, definition of: Block size
merging files: paste invocation
merging files in parallel: pr invocation
merging sorted files: sort invocation
message status: who invocation
message-digest, 128-bit: md5sum invocation
message-digest, 160-bit: sha1sum invocation
message-digest, 224-bit: sha2 utilities
message-digest, 256-bit: sha2 utilities
message-digest, 384-bit: sha2 utilities
message-digest, 512-bit: sha2 utilities
Meyering, J.: Introduction
Meyering, Jim: Authors of parse_datetime
midnight in date strings: Time of day items
min: Special
minute in date strings: Relative items in date strings
minutes, time zone correction by: Time of day items
mkdir: mkdir invocation
mkfifo: mkfifo invocation
mknod: mknod invocation
mktemp: mktemp invocation
modem control: Control
modes and umask: Umask and Protection
modes of created directories, setting: mkdir invocation
modes of created FIFOs, setting: mkfifo invocation
modification time, sorting files by: Sorting the output
modified command invocation: Modified command invocation
modified environment, running a program in a: env invocation
modify time, changing: touch invocation
month in date strings: Relative items in date strings
month names in date strings: Calendar date items
months, sorting by: sort invocation
months, written-out: General date syntax
MS-DOS file system: df invocation
MS-Windows file system: df invocation
mtime, changing: touch invocation
multicall: Multi-call invocation
multicolumn output, generating: pr invocation
multiple changes to permissions: Multiple Changes
multiplication: Numeric expressions
multipliers after numbers: dd invocation
multithreaded sort: sort invocation
mv: mv invocation

N
name follow option: tail invocation
name of kernel: uname invocation
named pipe check: File type tests
named pipes, creating: mkfifo invocation
network node name: uname invocation
never interactive option: rm invocation
newer files, copying only: cp invocation
newer files, moving only: mv invocation
newer-than file check: File characteristic tests
newline echoing after kill: Local
newline, echoing: Local
newline, translating to crlf: Output
newline, translating to return: Input
next day: Day of week items
next day: Options for date
next in date strings: General date syntax
NFS file system type: df invocation
NFS mounts from BSD to HP-UX: What information is listed
NFS mounts from BSD to HP-UX: du invocation
nice: nice invocation
niceness: nice invocation
nl: nl invocation
nl: Combination
nln: Output
no dereference: chcon invocation
no-op: true invocation
noatime: dd invocation
nocache: dd invocation
nocreat: dd invocation
noctty: dd invocation
node name: uname invocation
noerror: dd invocation
noflsh: Local
nofollow: dd invocation
nohup: nohup invocation
nohup.out: nohup invocation
nohup.out: nohup invocation
nolinks: dd invocation
non-directories, copying as special files: cp invocation
non-directories, copying as special files: cp invocation
non-directory suffix, stripping: dirname invocation
nonblock: dd invocation
nonblocking I/O: dd invocation
nonblocking stty setting: Special
none backup method: Backup options
none color option: General output formatting
none dd status=: dd invocation
none, sorting option for ls: Sorting the output
nonempty file check: File characteristic tests
nonprinting characters, ignoring: sort invocation
nonzero-length string check: String tests
noon in date strings: Time of day items
not-equal string check: String tests
notrunc: dd invocation
now in date strings: Relative items in date strings
noxfer dd status=: dd invocation
nproc: nproc invocation
NTFS file system: df invocation
ntfs file system file: df invocation
number of inputs to merge, nmerge: sort invocation
numbered backup method: Backup options
numbering lines: nl invocation
numbers, written-out: General date syntax
numeric expressions: Numeric expressions
numeric field padding: Padding and other flags
numeric modes: Numeric Modes
numeric operations: Numeric operations
numeric sequences: seq invocation
numeric sort: sort invocation
numeric tests: Numeric tests
numeric uid and gid: What information is listed
numeric user and group IDs: What information is listed
numfmt: numfmt invocation

O
obs: dd invocation
ocrnl: Output
octal dump of files: od invocation
octal numbers for file modes: Numeric Modes
od: od invocation
odd parity: Control
oddp: Combination
of: dd invocation
ofdel: Output
ofill: Output
oflag: dd invocation
olcuc: Output
older-than file check: File characteristic tests
once interactive option: rm invocation
one file system, restricting du to: du invocation
one file system, restricting rm to: rm invocation
one-line output format: df invocation
onlcr: Output
onlret: Output
onocr: Output
operating on characters: Operating on characters
operating on sorted files: Operating on sorted files
operating system name: uname invocation
opost: Output
option delimiter: Common options
options for date: Options for date
or operator: Connectives for test
or operator: Relations for expr
ordinal numbers: General date syntax
ospeed: Special
other permissions: Setting Permissions
output block size: dd invocation
output file name prefix: split invocation
output file name prefix: csplit invocation
output file name suffix: csplit invocation
output format: stat invocation
output format: stat invocation
output format, portable: df invocation
output NUL-byte-terminated lines: readlink invocation
output NUL-byte-terminated lines: du invocation
output NUL-byte-terminated lines: basename invocation
output NUL-byte-terminated lines: dirname invocation
output NUL-byte-terminated lines: realpath invocation
output NUL-byte-terminated lines: printenv invocation
output NUL-byte-terminated lines: env invocation
output of entire files: Output of entire files
output of parts of files: Output of parts of files
output settings: Output
output tabs: pr invocation
overwriting of input, allowed: sort invocation
overwriting of input, allowed: shuf invocation
owned by effective group ID check: Access permission tests
owned by effective user ID check: Access permission tests
owner of file, permissions for: Setting Permissions
owner, default: Mode Structure
ownership of installed files, setting: install invocation

P
p for FIFO file: mknod invocation
pad character: Output
pad instead of timing for delaying: Output
padding of numeric fields: Padding and other flags
paragraphs, reformatting: fmt invocation
parenb: Control
parent directories and cp: cp invocation
parent directories, creating: mkdir invocation
parent directories, creating missing: install invocation
parent directories, removing: rmdir invocation
parentheses for grouping: expr invocation
parity: Combination
parity errors, marking: Input
parity, ignoring: Input
parmrk: Input
parodd: Control
parse_datetime: Date input formats
parsing date strings: Options for date
parts of files, output of: Output of parts of files
pass8: Combination
paste: paste invocation
Paterson, R.: Introduction
PATH: env invocation
pathchk: pathchk invocation
pattern matching: String expressions
pebibyte, definition of: Block size
permission tests: Access permission tests
permissions of installed files, setting: install invocation
permissions, changing access: chmod invocation
permissions, copying existing: Copying Permissions
permissions, for changing file timestamps: touch invocation
permissions, output by ls: What information is listed
petabyte, definition of: Block size
phone directory order: sort invocation
pieces, splitting a file into: split invocation
Pinard, F.: Introduction
Pinard, F.: Authors of parse_datetime
pipe fitting: tee invocation
Plass, Michael F.: fmt invocation
platform, hardware: uname invocation
pm in date strings: Time of day items
portable file names, checking for: pathchk invocation
portable output format: df invocation
POSIX: Introduction
POSIX output format: df invocation
POSIXLY_CORRECT: Common options
POSIXLY_CORRECT: Standards conformance
POSIXLY_CORRECT: pr invocation
POSIXLY_CORRECT: sort invocation
POSIXLY_CORRECT: sort invocation
POSIXLY_CORRECT: dd invocation
POSIXLY_CORRECT: echo invocation
POSIXLY_CORRECT: printf invocation
POSIXLY_CORRECT: id invocation
POSIXLY_CORRECT, and block size: Block size
pr: pr invocation
prime factors: factor invocation
print: Character sets
print machine hardware name: arch invocation
print name of current directory: pwd invocation
print system information: uname invocation
print terminal file name: tty invocation
Print the number of processors: nproc invocation
printenv: printenv invocation
printf: printf invocation
printing all or some environment variables: printenv invocation
printing color database: dircolors invocation
printing current user information: who invocation
printing current usernames: users invocation
printing groups a user is in: groups invocation
printing real and effective user and group IDs: id invocation
printing text: echo invocation
printing text, commands for: Printing text
printing the current time: date invocation
printing the effective user ID: whoami invocation
printing the host identifier: hostid invocation
printing the hostname: hostname invocation
printing the system uptime and load: uptime invocation
printing user’s login name: logname invocation
printing, preparing files for: pr invocation
process zero-terminated items: head invocation
process zero-terminated items: tail invocation
process zero-terminated items: sort invocation
process zero-terminated items: shuf invocation
process zero-terminated items: uniq invocation
process zero-terminated items: comm invocation
process zero-terminated items: cut invocation
process zero-terminated items: paste invocation
process zero-terminated items: join invocation
process zero-terminated items: numfmt invocation
processes, commands for controlling: Process control
progress dd status=: dd invocation
prompting, and ln: ln invocation
prompting, and mv: mv invocation
prompting, and rm: rm invocation
prompts, forcing: mv invocation
prompts, omitting: mv invocation
prompts, omitting: mv invocation
prterase: Local
ptx: ptx invocation
punct: Character sets
pure numbers in date strings: Pure numbers in date strings
pwd: pwd invocation

Q
quit: Characters
quoting style: Formatting the file names

R
radix for file offsets: od invocation
random seed: Random sources
random sort: sort invocation
random source for shredding: shred invocation
random source for shuffling: shuf invocation
random source for sorting: sort invocation
random sources: Random sources
ranges: Character sets
raw: Combination
read errors, ignoring: dd invocation
read from stdin and write to stdout and files: tee invocation
read permission: Mode Structure
read permission, symbolic: Setting Permissions
read system call, and holes: cp invocation
readable file check: Access permission tests
readlink: readlink invocation
real user and group IDs, printing: id invocation
realpath: readlink invocation
realpath: realpath invocation
realpath: realpath invocation
realpath: realpath invocation
record separator character: split invocation
recursive directory listing: Which files are listed
recursively changing access permissions: chmod invocation
recursively changing file ownership: chown invocation
recursively changing group ownership: chgrp invocation
recursively copying directories: cp invocation
recursively copying directories: cp invocation
redirection: Redirection
reference file: chcon invocation
reformatting paragraph text: fmt invocation
regular expression matching: String expressions
regular file check: File type tests
relations, numeric or string: Relations for expr
relative items in date strings: Relative items in date strings
release of kernel: uname invocation
relpath: realpath invocation
remainder: Numeric expressions
remote hostname: who invocation
removing characters: Squeezing and deleting
removing empty directories: rmdir invocation
removing files after shredding: shred invocation
removing files or directories: rm invocation
removing files or directories (via the unlink syscall): unlink invocation
removing permissions: Setting Permissions
repeat output values: shuf invocation
repeated characters: Character sets
repeated lines, outputting: uniq invocation
repeated output of a string: yes invocation
restricted deletion flag: Mode Structure
return, ignoring: Input
return, translating to newline: Input
return, translating to newline: Output
reverse sorting: sort invocation
reverse sorting: Sorting the output
reversing files: tac invocation
rm: rm invocation
rmdir: rmdir invocation
rn format for nl: nl invocation
root as default owner: install invocation
root directory, allow recursive destruction: rm invocation
root directory, allow recursive modification: chown invocation
root directory, allow recursive modification: chgrp invocation
root directory, allow recursive modification: chmod invocation
root directory, disallow recursive destruction: rm invocation
root directory, disallow recursive modification: chown invocation
root directory, disallow recursive modification: chgrp invocation
root directory, disallow recursive modification: chmod invocation
root directory, running a program in a specified: chroot invocation
rows: Special
rprnt: Characters
RTS/CTS flow control: Control
run commands with bounded time: timeout invocation
run with security context: runcon invocation
runcon: runcon invocation
running a program in a modified environment: env invocation
running a program in a specified root directory: chroot invocation
rz format for nl: nl invocation

S
Salz, Rich: Authors of parse_datetime
same file check: File characteristic tests
sane: Combination
scheduling, affecting: nice invocation
screen columns: fold invocation
seconds since the epoch: Time conversion specifiers
section delimiters of pages: nl invocation
security context: What information is listed
security context: cp invocation
security context: install invocation
security context: install invocation
security context: mv invocation
security context: mkdir invocation
security context: mkfifo invocation
security context: mknod invocation
security context: id invocation
seek: dd invocation
seek_bytes: dd invocation
self-backups: cp invocation
SELinux: What information is listed
SELinux: install invocation
SELinux: id invocation
SELinux context: SELinux context
SELinux, context: SELinux context
SELinux, restoring security context: mv invocation
SELinux, setting/restoring security context: cp invocation
SELinux, setting/restoring security context: install invocation
SELinux, setting/restoring security context: mkdir invocation
SELinux, setting/restoring security context: mkfifo invocation
SELinux, setting/restoring security context: mknod invocation
send a signal to processes: kill invocation
sentences and line-breaking: fmt invocation
separator for numbers in seq: seq invocation
seq: seq invocation
sequence of numbers: seq invocation
set-group-ID: Mode Structure
set-group-ID check: Access permission tests
set-user-ID: Mode Structure
set-user-ID check: Access permission tests
setgid: Mode Structure
setting permissions: Setting Permissions
setting the hostname: hostname invocation
setting the time: Setting the time
setuid: Mode Structure
setup for color: dircolors invocation
sh syntax for color setup: dircolors invocation
SHA-1: sha1sum invocation
SHA-2: sha2 utilities
sha1sum: sha1sum invocation
sha224sum: sha2 utilities
sha256sum: sha2 utilities
sha384sum: sha2 utilities
sha512sum: sha2 utilities
SHELL environment variable, and color: General output formatting
SHELL environment variable, and color: dircolors invocation
shell utilities: Top
shred: shred invocation
shuf: shuf invocation
shuffling files: shuf invocation
SI output: Block size
SI output: What information is listed
SI output: df invocation
SI output: du invocation
signals, specifying: Signal specifications
simple backup method: Backup options
SIMPLE_BACKUP_SUFFIX: Backup options
single-column output of files: General output formatting
size: Special
size for main memory sorting: sort invocation
size of file to shred: shred invocation
size of files, reporting: What information is listed
size of files, sorting files by: Sorting the output
skip: dd invocation
skip_bytes: dd invocation
sleep: sleep invocation
socket check: File type tests
software flow control: Input
sort: sort invocation
sort field: sort invocation
sort stability: sort invocation
sort stability: sort invocation
sort’s last-resort comparison: sort invocation
sort’s last-resort comparison: sort invocation
sorted files, operations on: Operating on sorted files
sorting files: sort invocation
sorting ls output: Sorting the output
space: Character sets
space parity: Control
sparse: dd invocation
sparse files, copying: cp invocation
sparse files, creating: truncate invocation
special characters: Characters
special file types: Special file types
special file types: Special file types
special files: mknod invocation
special settings: Special
specifying sets of characters: Character sets
speed: Special
split: split invocation
splitting a file into pieces: split invocation
splitting a file into pieces by context: csplit invocation
squeezing blank lines: cat invocation
squeezing empty lines: cat invocation
squeezing repeat characters: Squeezing and deleting
Stallman, R.: Introduction
standard input: Common options
standard output: Common options
standard streams, buffering: stdbuf invocation
start: Characters
stat: stat invocation
status: dd invocation
status: Characters
status time, printing or sorting by: Sorting the output
status time, show the most recent: du invocation
stdbuf: stdbuf invocation
stick parity: Control
sticky: Mode Structure
sticky bit check: Access permission tests
stop: Characters
stop bits: Control
strftime and date: date invocation
string constants, outputting: od invocation
string expressions: String expressions
string tests: String tests
strip directory and suffix from file names: basename invocation
stripping non-directory suffix: dirname invocation
stripping symbol table information: install invocation
stripping trailing slashes: cp invocation
stripping trailing slashes: mv invocation
stty: stty invocation
substr: String expressions
subtracting permissions: Setting Permissions
subtraction: Numeric expressions
successful exit: true invocation
suffix, stripping from file names: basename invocation
sum: sum invocation
summarizing files: Summarizing files
superblock, writing: sync invocation
supplementary groups, printing: groups invocation
susp: Characters
swab (byte-swapping): dd invocation
swap space, saving text image in: Mode Structure
swtch: Characters
symbol table information, stripping: install invocation
symbol table information, stripping, program: install invocation
symbolic (soft) links, creating: ln invocation
symbolic link check: File type tests
symbolic link to directory, controlling traversal of: Traversing symlinks
symbolic link to directory, never traverse: Traversing symlinks
symbolic link to directory, never traverse: chown invocation
symbolic link to directory, never traverse: chgrp invocation
symbolic link to directory, never traverse: chcon invocation
symbolic link to directory, traverse each that is encountered: Traversing symlinks
symbolic link to directory, traverse each that is encountered: chown invocation
symbolic link to directory, traverse each that is encountered: chgrp invocation
symbolic link to directory, traverse each that is encountered: chcon invocation
symbolic link to directory, traverse if on the command line: Traversing symlinks
symbolic link to directory, traverse if on the command line: chown invocation
symbolic link to directory, traverse if on the command line: chgrp invocation
symbolic link to directory, traverse if on the command line: chcon invocation
symbolic link, defined: ln invocation
symbolic links and ln: ln invocation
symbolic links and pwd: pwd invocation
symbolic links, changing group: chgrp invocation
symbolic links, changing owner: chown invocation
symbolic links, changing owner: chown invocation
symbolic links, changing owner: chown invocation
symbolic links, changing owner: chgrp invocation
symbolic links, changing time: touch invocation
symbolic links, copying: cp invocation
symbolic links, copying: cp invocation
symbolic links, copying with: cp invocation
symbolic links, dereferencing: Which files are listed
symbolic links, dereferencing: Which files are listed
symbolic links, dereferencing: Which files are listed
symbolic links, dereferencing in du: du invocation
symbolic links, dereferencing in du: du invocation
symbolic links, dereferencing in stat: stat invocation
symbolic links, following: dd invocation
symbolic links, permissions of: chmod invocation
symbolic modes: Symbolic Modes
symlinks, resolution: realpath invocation
sync: sync invocation
sync: dd invocation
sync (padding with ASCII NULs): dd invocation
Synchronize cached writes to persistent storage: sync invocation
synchronize disk and memory: sync invocation
synchronized data and metadata I/O: dd invocation
synchronized data and metadata writes, before finishing: dd invocation
synchronized data reads: dd invocation
synchronized data writes, before finishing: dd invocation
system context: System context
system information, printing: arch invocation
system information, printing: nproc invocation
system information, printing: uname invocation
system name, printing: hostname invocation
System V sum: sum invocation

T
tab stops, setting: expand invocation
tabn: Output
tabs: Combination
tabs to spaces, converting: expand invocation
tac: tac invocation
tagged paragraphs: fmt invocation
tail: tail invocation
tandem: Input
target directory: Target directory
target directory: Target directory
target directory: Target directory
target directory: cp invocation
target directory: cp invocation
target directory: install invocation
target directory: install invocation
target directory: mv invocation
target directory: mv invocation
target directory: ln invocation
target directory: ln invocation
tebibyte, definition of: Block size
tee: tee invocation
telephone directory order: sort invocation
temporary directory: sort invocation
temporary files and directories: mktemp invocation
terabyte, definition of: Block size
terminal check: File type tests
terminal file name, printing: tty invocation
terminal lines, currently used: who invocation
terminal settings: stty invocation
terminal, using color iff: General output formatting
terse output: stat invocation
test: test invocation
text: dd invocation
text I/O: dd invocation
text image, saving in swap space: Mode Structure
text input files: md5sum invocation
text utilities: Top
text, displaying: echo invocation
text, reformatting: fmt invocation
this in date strings: Relative items in date strings
time: touch invocation
time: Special
time conversion specifiers: Time conversion specifiers
time formats: pr invocation
time formats: date invocation
time limit: timeout invocation
time of day item: Time of day items
time setting: Setting the time
time style: Formatting file timestamps
time style: du invocation
time units: timeout invocation
time units: sleep invocation
time zone correction: Time of day items
time zone item: General date syntax
time zone item: Time zone items
time, printing or setting: date invocation
timeout: timeout invocation
timestamps of installed files, preserving: install invocation
timestamps, changing file: touch invocation
TIME_STYLE: Formatting file timestamps
TIME_STYLE: du invocation
TMPDIR: sort invocation
TMPDIR: sort invocation
today in date strings: Relative items in date strings
tomorrow: Options for date
tomorrow in date strings: Relative items in date strings
topological sort: tsort invocation
tostop: Local
total counts: wc invocation
touch: touch invocation
tr: tr invocation
trailing slashes: Trailing slashes
translating characters: Translating
true: true invocation
truncate: truncate invocation
truncating output file, avoiding: dd invocation
truncating, file sizes: truncate invocation
tsort: tsort invocation
tty: tty invocation
two-way parity: Control
type size: od invocation
TZ: pr invocation
TZ: Formatting file timestamps
TZ: touch invocation
TZ: stat invocation
TZ: who invocation
TZ: date invocation
TZ: Options for date
TZ: Specifying time zone rules

U
u, and disabling special characters: Characters
ucase, converting to: dd invocation
umask and modes: Umask and Protection
uname: uname invocation
unblock: dd invocation
unexpand: unexpand invocation
Unicode: printf invocation
uniq: uniq invocation
unique lines, outputting: uniq invocation
uniquify files: uniq invocation
uniquifying output: sort invocation
unlink: unlink invocation
unprintable characters, ignoring: sort invocation
unsorted directory listing: Sorting the output
upper: Character sets
uppercase, translating to lowercase: Input
uptime: uptime invocation
use time, changing: touch invocation
use time, printing or sorting files by: Sorting the output
use time, printing or sorting files by: Sorting the output
use time, show the most recent: du invocation
user IDs, disambiguating: Disambiguating names and IDs
user information, commands for: User information
user name, printing: logname invocation
user names, disambiguating: Disambiguating names and IDs
usernames, printing current: users invocation
users: users invocation
UTC: Options for date
utmp: logname invocation
utmp: users invocation
utmp: who invocation

V
valid file names, checking for: pathchk invocation
variable-length records, converting to fixed-length: dd invocation
vdir: vdir invocation
verbose ls format: What information is listed
verifying MD5 checksums: md5sum invocation
verifying MD5 checksums: md5sum invocation
verifying MD5 checksums: md5sum invocation
verifying MD5 checksums: md5sum invocation
verifying MD5 checksums: md5sum invocation
version number sort: sort invocation
version number, finding: Common options
version of kernel: uname invocation
version, sorting option for ls: Sorting the output
version-control Emacs variable: Backup options
VERSION_CONTROL: Backup options
VERSION_CONTROL: cp invocation
VERSION_CONTROL: install invocation
VERSION_CONTROL: mv invocation
VERSION_CONTROL: ln invocation
vertical sorted files in columns: General output formatting
vtn: Output

W
wc: wc invocation
week in date strings: Relative items in date strings
werase: Characters
who: who invocation
who am i: who invocation
whoami: whoami invocation
word count: wc invocation
working context: Working context
working directory, printing: pwd invocation
wrap data: base64 invocation
wrapping long input lines: fold invocation
writable file check: Access permission tests
write permission: Mode Structure
write permission, symbolic: Setting Permissions
write, allowed: who invocation
wtmp: users invocation
wtmp: who invocation

X
xcase: Local
xdigit: Character sets
xfs file system type: df invocation
XON/XOFF flow control: Input

Y
year in date strings: Relative items in date strings
yes: yes invocation
yesterday: Options for date
yesterday in date strings: Relative items in date strings
yottabyte, definition of: Block size
Youmans, B.: Introduction

Z
zero-length string check: String tests
zettabyte, definition of: Block size

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