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8. Bzip2¸¦ grep¿Í °°ÀÌ ¾²±â

³»°¡ bgrepÀ» ½ÇÇàÇÒ ¶§¿¡´Â linux ¿Í °°ÀÌ ¿À´Â zgrep¿¡ »ç¼ÒÇÑ ¼öÁ¤ÀÌ °¡ÇØÁø´Ù. ´ç½ÅÀº bunzip2 ¸í·ÉÀÇ »ç¿ë ¾øÀ̵µ ÀÏ´ÜÀº grepÀ» »ç¿ëÇÒ ¼ö ÀÖÀ» °ÍÀÌ´Ù.


#!/bin/sh
# bgrep -- a wrapper around a grep program that decompresses files as needed
  PATH="/usr/bin:$PATH"; export PATH
prog=`echo $0 | sed 's|.*/||'`
  case "$prog" in
          *egrep) grep=${EGREP-egrep}     ;;
          *fgrep) grep=${FGREP-fgrep}     ;;
          *)      grep=${GREP-grep}       ;;
  esac
  pat=""
  while test $# -ne 0; do
    case "$1" in
    -e | -f) opt="$opt $1"; shift; pat="$1"
             if test "$grep" = grep; then  # grep is buggy with -e on SVR4
               grep=egrep
             fi;;
    -*)      opt="$opt $1";;
     *)      if test -z "$pat"; then
               pat="$1"
             else
               break;
             fi;;
    esac
    shift
  done
if test -z "$pat"; then
    echo "grep through bzip2 files"
    echo "usage: $prog [grep_options] pattern [files]"
    exit 1
  fi
list=0
  silent=0
  op=`echo "$opt" | sed -e 's/ //g' -e 's/-//g'`
  case "$op" in
    *l*) list=1
  esac
  case "$op" in
    *h*) silent=1
  esac
if test $# -eq 0; then
    bzip2 -cd | $grep $opt "$pat"
    exit $?
  fi
res=0
  for i do
    if test $list -eq 1; then
      bzip2 -cdfq "$i" | $grep $opt "$pat" > /dev/null && echo $i
      r=$?
    elif test $# -eq 1 -o $silent -eq 1; then
      bzip2 -cd "$i" | $grep $opt "$pat"
      r=$?
    else
      bzip2 -cd "$i" | $grep $opt "$pat" | sed "s|^|${i}:|"
      r=$?
    fi
    test "$r" -ne 0 && res="$r"
  done
  exit $res


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