Variable: dired-compress-file-alist

dired-compress-file-alist is a variable defined in dired-aux.el.gz.

Value

(("\\.gz\\'" . "gzip -9f %i") ("\\.bz2\\'" . "bzip2 -9f %i")
 ("\\.xz\\'" . "xz -9f %i")
 ("\\.zst\\'" . "zstd -qf -19 --rm -o %o %i"))

Documentation

Controls the compression shell command for dired-do-compress-to.

Each element is (REGEXP . CMD), where REGEXP is the name of the archive to which you want to compress, and CMD is the corresponding command.

Within CMD, %i denotes the input file(s), and %o denotes the output file. %i path(s) are relative, while %o is absolute.

Probably introduced at or before Emacs version 28.1.

Source Code

;; Defined in /usr/src/emacs/lisp/dired-aux.el.gz
(defvar dired-compress-file-alist
  '(("\\.gz\\'" . "gzip -9f %i")
    ("\\.bz2\\'" . "bzip2 -9f %i")
    ("\\.xz\\'" . "xz -9f %i")
    ("\\.zst\\'" . "zstd -qf -19 --rm -o %o %i"))
  "Controls the compression shell command for `dired-do-compress-to'.

Each element is (REGEXP . CMD), where REGEXP is the name of the
archive to which you want to compress, and CMD is the
corresponding command.

Within CMD, %i denotes the input file(s), and %o denotes the
output file.  %i path(s) are relative, while %o is absolute.")