www.pudn.com > gzip_win.zip > zforce.in

: 
#!/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.gz 
 
PATH="BINDIR:$PATH"; export PATH 
x=`basename $0` 
if test $# = 0; then 
  echo "force a '.gz' extension on all gzip files" 
  echo usage: $x files... 
  exit 1 
fi 
 
res=0 
for 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 
  fi 
done 
exit $res