usr.bin/gzip/zgrep

   1 #!/bin/sh
   2 #
   3 # $NetBSD: zgrep,v 1.7 2008/05/08 15:35:23 wiz Exp $
   4 # $DragonFly: src/usr.bin/gzip/zgrep,v 1.1 2004/10/26 11:19:31 joerg Exp $
   5 #
   6 # Copyright (c) 2003 Thomas Klausner.
   7 #
   8 # Redistribution and use in source and binary forms, with or without
   9 # modification, are permitted provided that the following conditions
  10 # are met:
  11 # 1. Redistributions of source code must retain the above copyright
  12 #    notice, this list of conditions and the following disclaimer.
  13 # 2. Redistributions in binary form must reproduce the above copyright
  14 #    notice, this list of conditions and the following disclaimer in the
  15 #    documentation and/or other materials provided with the distribution.
  16 #
  17 # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18 # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19 # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20 # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21 # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22 # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26 # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27
  28 grep=/usr/bin/grep
  29 zcat=/usr/bin/zcat
  30
  31 endofopts=0
  32 pattern_found=0
  33 grep_args=""
  34 hyphen=0
  35 silent=0
  36
  37 prg=$0
  38
  39 # handle being called 'zegrep' or 'zfgrep'
  40 case ${prg} in
  41     *zegrep)
  42         grep_args="-E";;
  43     *zfgrep)
  44         grep_args="-F";;
  45 esac
  46
  47 # skip all options and pass them on to grep taking care of options
  48 # with arguments, and if -e was supplied
  49
  50 while [ $# -gt 0 -a ${endofopts} -eq 0 ]
  51 do
  52     case $1 in
  53     # from GNU grep-2.5.1 -- keep in sync!
  54         -[ABCDXdefm])
  55             if [ $# -lt 2 ]
  56                 then
  57                 echo "${prg}: missing argument for $1 flag" >&2
  58                 exit 1
  59             fi
  60             case $1 in
  61                 -e)
  62                     pattern="$2"
  63                     pattern_found=1
  64                     shift 2
  65                     break
  66                     ;;
  67                 *)
  68                     ;;
  69             esac
  70             grep_args="${grep_args} $1 $2"
  71             shift 2
  72             ;;
  73         --)
  74             shift
  75             endofopts=1
  76             ;;
  77         -)
  78             hyphen=1
  79             shift
  80             ;;
  81         -h)
  82             silent=1
  83             shift
  84             ;;
  85         -*)
  86             grep_args="${grep_args} $1"
  87             shift
  88             ;;
  89         *)
  90             # pattern to grep for
  91             endofopts=1
  92             ;;
  93     esac
  94 done
  95
  96 # if no -e option was found, take next argument as grep-pattern
  97 if [ ${pattern_found} -lt 1 ]
  98 then
  99     if [ $# -ge 1 ]; then
 100         pattern="$1"
 101         shift
 102     elif [ ${hyphen} -gt 0 ]; then
 103         pattern="-"
 104     else
 105         echo "${prg}: missing pattern" >&2
 106         exit 1
 107     fi
 108 fi
 109
 110 # call grep ...
 111 if [ $# -lt 1 ]
 112 then
 113     # ... on stdin
 114     ${zcat} -fq - | ${grep} ${grep_args} -- "${pattern}" -
 115 else
 116     # ... on all files given on the command line
 117     if [ ${silent} -lt 1 ]; then
 118         grep_args="-H ${grep_args}"
 119     fi
 120     while [ $# -gt 0 ]
 121     do
 122         ${zcat} -fq -- "$1" | ${grep} --label="${1}" ${grep_args} -- "${pattern}" -
 123         shift
 124     done
 125 fi
 126
 127 exit 0