sample/zfile

   1 #!/bin/sh
   2
   3 if test $# = 0; then
   4   echo 'zfile: file(1) for programs which may be compressed with gzexe'
   5   echo usage: `basename $0`  files...
   6   exit 1
   7 fi
   8
   9 tmp=/tmp/gz$$
  10
  11 for i do
  12   if test ! -f "$i" ; then
  13     echo `basename $0`: $i not a file
  14     res=1
  15     continue
  16   fi
  17   skip=18
  18   if sed -e 1d -e 2q "$i" | grep "^skip=[0-9]*$" >/dev/null; then
  19     eval `sed -e 1d -e 2q "$i"`
  20   fi
  21   if tail +$skip "$i" | gzip --list >/dev/null 2>&1; then
  22     tail +$skip "$i" | gzip -cd | dd count=1 >$tmp 2>/dev/null
  23     file $tmp | sed "s|^$tmp|$i|"
  24   else
  25     file "$i"
  26   fi
  27   rm -f $tmp
  28 done