Mark files for which predicate returns non-nil
(dired-mark-sexp). With a prefix argument, unflag those files
instead.
The predicate is a Lisp expression that can refer to the following symbols:
inode[integer] the inode of the file (only for ‘ls -i’ output)
s[integer] the size of the file for ‘ls -s’ output (usually in blocks or, with ‘-k’, in KBytes)
mode[string] file permission bits, e.g., ‘-rw-r--r--’
nlink[integer] number of links to file
uid[string] owner
gid[string] group (If the gid is not displayed by ‘ls’, this will still be set (to the same as uid))
size[integer] file size in bytes
time[string] the time that ‘ls’ displays, e.g., ‘Feb 12 14:17’
name[string] the name of the file
sym[string] if file is a symbolic link, the linked-to name, else ""
For example, use
(equal 0 size)
to mark all zero length files.
To find out all not yet compiled Emacs Lisp files in a directory, Dired all .el files in the lisp directory using the wildcard ‘*.el’. Then use M-( with
(not (file-exists-p (concat name "c")))
to mark all .el files without a corresponding .elc file.