cat: Concatenate and write files
cat copies each file (‘-’ means standard input), or
standard input if none are given, to standard output. Synopsis:
cat [option] [file]…
The program accepts the following options. Also see Common options.
Equivalent to -vET.
Number all nonempty output lines, starting with 1.
Equivalent to -vE.
Display a ‘$’ after the end of each line.
Number all output lines, starting with 1. This option is ignored if -b is in effect.
Suppress repeated adjacent blank lines; output just one empty line instead of several.
Equivalent to -vT.
Display TAB characters as ‘^I’.
Ignored; for POSIX compatibility.
Display control characters except for LFD and TAB using ‘^’ notation and precede characters that have the high bit set with ‘M-’.
On systems like MS-DOS that distinguish between text and binary files,
cat normally reads and writes in binary mode. However,
cat reads in text mode if one of the options
-bensAE is used or if
cat is reading from standard
input and standard input is a terminal. Similarly,
writes in text mode if one of the options -bensAE is used or
if standard output is a terminal.
An exit status of zero indicates success, and a nonzero value indicates failure.
# Output f's contents, then standard input, then g's contents. cat f - g # Copy standard input to standard output. cat