gnu/usr.bin/grep/fgrep/fgrep

   1 #!/bin/sh
   2 grep=grep
   3 case $0 in
   4   */*)
   5     dir=${0%/*}
   6     if test -x "$dir/grep"; then
   7       PATH=$dir:$PATH
   8       grep=grep
   9     fi;;
  10 esac
  11 exec $grep -F "$@"