Add lz and its README

lz/README

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+The lz script emulates and extends the lz and uz commands of the mtools.
+
+It handles: .tar, .tar.gz, .tar.bz2, .tar.xz and .tar.lzma, through the
+standards options of GNU tar.
+
+If the script name is "lz", the archive content is displayed. If the name
+is "uz", it is extracted.
+
+To install lz and uz, move put script in a directory in the PATH (for
+instance /usr/local/bin) and hard link it to uz:
+  cp lz /usr/local/bin
+  ln /usr/local/bin/{lz,uz}

lz/lz

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+#!/bin/sh
+# This script emulates and extends the lz and uz commands of the mtools.
+# It handles: .tar, .tar.gz, .tar.bz2, .tar.xz and .tar.lzma, through the
+# standards options of GNU tar.
+# If the script name is "lz", the archive content is displayed. If the name
+# is "uz", it is extracted.
+
+PROGRAM=`basename $0`
+
+if [ "$PROGRAM" = "lz" ] ; then
+	ACTION="t"
+elif [ "$PROGRAM" = "uz" ] ; then
+	ACTION="x"
+else
+	echo '$0 = "'"$0"' (not "lz" nor "uz")!'
+	exit 1
+fi
+
+if [ `basename "$1" .tar` != "$1" ] ; then
+	FORMAT=""
+elif [ `basename "$1" .tar.gz` != "$1" ] ; then
+	FORMAT="--gzip"
+elif [ `basename "$1" .tar.bz2` != "$1" ] ; then
+	FORMAT="--bzip"
+elif [ `basename "$1" .tar.xz` != "$1" ] ; then
+	FORMAT="--xz"
+elif [ `basename "$1" .tar.lzma` != "$1" ] ; then
+	FORMAT="--lzma"
+fi
+
+tar "$FORMAT" -"$ACTION"f "$@"