/usr/bin/uz is in mtools 4.0.12-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 | #!/bin/sh
# Copyright 1994,2002 David C. Niemi.
# Copyright 1996,1997,2001-2003 Alain Knaff.
# This file is part of mtools.
#
# Mtools is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Mtools is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Mtools.  If not, see <http://www.gnu.org/licenses/>.
# uz [file...]
# lz [file...]
#
# If called "uz", gunzips and extracts a gzip'd tar'd archive.
# If called "lz", gunzips and shows a listing of a gzip'd tar'd archive.
#
# Requires: gzip and tar in the user's path.  Should work with most tars.
# "-" is now used for backwards compatibility with antique tars, e.g. SCO.
#
# 1994/02/19	DCN	Created (as a trivial, but useful script)
# 1994/12/01	DCN	Combined uz and lz, added suffix handling
# 2002/09/11	DCN	Added bzip2 support
#
# Copyright (C) 1994, 2002 David C. Niemi (niemi at tuxers dot net)
# The author requires that any copies or derived works include this
# copyright notice; no other restrictions are placed on its use.
#
set -e
set -u
## Default unzipping command
uzcmd='gzip -cd'
case $0 in
*uz)
	tarparam="-pxvf"
	action="Extracting from "
	;;
*lz)
	tarparam="-tvf"
	action="Reading directory of "
	;;
*)
	echo "$0: expect to be named either \"uz\" or \"lz\"." >&2
	exit 1
	;;
esac
if [ $# = 0 ]; then
	echo "$action standard input." >&2
	$uzcmd - | tar "$tarparam" -
	exit 0
fi
while [ $# -ge 1 ]; do
	echo >&2
	found=
	for suffix in "" .gz .tgz .tar.gz .z .tar.z .taz .tpz .Z .tar.Z .tar.bz2; do
		if [ -r "${1}$suffix" ]; then
			found=$1$suffix
			break
		fi
	done
	case $found in
		*.tar.bz2 | *.tb2)
			uzcmd='bzip2 -cd'
			;;
	esac
	if [ -z "$found" ]; then
		echo "$0: could not read \"$1\"." >&2
	else
		echo "$action \"$found\"." >&2
		$uzcmd -- "$found" | tar "$tarparam" -
	fi
	shift
done
exit 0
 |