usr.bin/gzip/zgrep

   1 #!/bin/sh
   2 #
   3 # $NetBSD: zgrep,v 1.6 2008/04/27 09:27:55 nakayama Exp $
   4 #
   5 # Copyright (c) 2003 Thomas Klausner.
   6 #
   7 # Redistribution and use in source and binary forms, with or without
   8 # modification, are permitted provided that the following conditions
   9 # are met:
  10 # 1. Redistributions of source code must retain the above copyright
  11 #    notice, this list of conditions and the following disclaimer.
  12 # 2. Redistributions in binary form must reproduce the above copyright
  13 #    notice, this list of conditions and the following disclaimer in the
  14 #    documentation and/or other materials provided with the distribution.
  15 #
  16 # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17 # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18 # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19 # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20 # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21 # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25 # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26
  27 grep=/usr/bin/grep
  28 zcat=/usr/bin/zcat
  29
  30 endofopts=0
  31 pattern_found=0
  32 grep_args=""
  33 hyphen=0
  34 silent=0
  35
  36 prg=$0
  37
  38 # handle being called 'zegrep' or 'zfgrep'
  39 case ${prg} in
  40     *zegrep)
  41         grep_args="-E";;
  42     *zfgrep)
  43         grep_args="-F";;
  44 esac
  45
  46 # skip all options and pass them on to grep taking care of options
  47 # with arguments, and if -e was supplied
  48
  49 while [ $# -gt 0 -a ${endofopts} -eq 0 ]
  50 do
  51     case $1 in
  52     # from GNU grep-2.5.1 -- keep in sync!
  53         -[ABCDXdefm])
  54             if [ $# -lt 2 ]
  55                 then
  56                 echo "${prg}: missing argument for $1 flag" >&2
  57                 exit 1
  58             fi
  59             case $1 in
  60                 -e)
  61                     pattern="$2"
  62                     pattern_found=1
  63                     shift 2
  64                     break
  65                     ;;
  66                 *)
  67                     ;;
  68             esac
  69             grep_args="${grep_args} $1 $2"
  70             shift 2
  71             ;;
  72         --)
  73             shift
  74             endofopts=1
  75             ;;
  76         -)
  77             hyphen=1
  78             shift
  79             ;;
  80         -h)
  81             silent=1
  82             shift
  83             ;;
  84         -*)
  85             grep_args="${grep_args} $1"
  86             shift
  87             ;;
  88         *)
  89             # pattern to grep for
  90             endofopts=1
  91             ;;
  92     esac
  93 done
  94
  95 # if no -e option was found, take next argument as grep-pattern
  96 if [ ${pattern_found} -lt 1 ]
  97 then
  98     if [ $# -ge 1 ]; then
  99         pattern="$1"
 100         shift
 101     elif [ ${hyphen} -gt 0 ]; then
 102         pattern="-"
 103     else
 104         echo "${prg}: missing pattern" >&2
 105         exit 1
 106     fi
 107 fi
 108
 109 # call grep ...
 110 if [ $# -lt 1 ]
 111 then
 112     # ... on stdin
 113     ${zcat} -fq - | ${grep} ${grep_args} -- "${pattern}" -
 114 else
 115     # ... on all files given on the command line
 116     if [ ${silent} -lt 1 ]; then
 117         grep_args="-H ${grep_args}"
 118     fi
 119     while [ $# -gt 0 ]
 120     do
 121         ${zcat} -fq -- "$1" | ${grep} --label="${1}" ${grep_args} -- "${pattern}" -
 122         shift
 123     done
 124 fi
 125
 126 exit 0