#!/bin/sh
# 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
#
# Copyright (C) 1994 David C. Niemi (niemidc@erols.com)
# 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

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
	gzip -cd - | tar "$tarparam" -
	exit 0
fi

while [ $# -ge 1 ]; do
	echo >&2
	found=
	for suffix in "" .gz .tgz .tar.gz .z .tar.z .taz .tpz .Z .tar.Z ; do
		if [ -r "${1}$suffix" ]; then
			found=$1$suffix;
			break;
		fi
	done
	if [ -z "$found" ]; then
		echo "$0: could not read \"$1\"." >&2
	else
		echo "$action \"$found\"." >&2
		gzip -cd -- "$found" | tar "$tarparam" -
	fi
	shift
done

exit 0