:#!/bin/sh# zforce: force a gz extension on all gzip files so that gzip will not# compress them twice.## This can be useful for files with names truncated after a file transfer.# 12345678901234 is renamed to 12345678901.gzPATH="BINDIR:$PATH"; export PATHx=`basename $0`if test $# = 0; then  echo "force a '.gz' extension on all gzip files"  echo usage: $x files...  exit 1fires=0for i do  if test ! -f "$i" ; then    echo ${x}: $i not a file    res=1    continue  fi  test `expr "$i" : '.*[.-]z$'` -eq 0 || continue  test `expr "$i" : '.*[.-]gz$'` -eq 0 || continue  test `expr "$i" : '.*[.]t[ag]z$'` -eq 0 || continue  if gzip -l < "$i" 2>/dev/null | grep '^defl' > /dev/null; then    if test `expr "$i" : '^............'` -eq 12; then      new=`expr "$i" : '\(.*\)...$`.gz    else      new="$i.gz"    fi    if mv "$i" "$new" 2>/dev/null; then      echo $i -- replaced with $new      continue    fi    res=1; echo ${x}: cannot rename $i to $new  fidoneexit $res