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zgrep revision 1.6 
      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 # 3. The name of the author may not be used to endorse or promote products
     16 #    derived from this software without specific prior written permission.
     17 #
     18 # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     19 # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     20 # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     21 # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     22 # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     23 # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     24 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     25 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     26 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     27 # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28 
     29 grep=/usr/bin/grep
     30 zcat=/usr/bin/zcat
     31 
     32 endofopts=0
     33 pattern_found=0
     34 grep_args=""
     35 hyphen=0
     36 silent=0
     37 
     38 prg=$0
     39 
     40 # handle being called 'zegrep' or 'zfgrep'
     41 case ${prg} in
     42     *zegrep)
     43 	grep_args="-E";;
     44     *zfgrep)
     45 	grep_args="-F";;
     46 esac
     47 
     48 # skip all options and pass them on to grep taking care of options
     49 # with arguments, and if -e was supplied
     50 
     51 while [ $# -gt 0 -a ${endofopts} -eq 0 ]
     52 do
     53     case $1 in
     54     # from GNU grep-2.5.1 -- keep in sync!
     55 	-[ABCDXdefm])
     56 	    if [ $# -lt 2 ]
     57 		then
     58 		echo "${prg}: missing argument for $1 flag" >&2
     59 		exit 1
     60 	    fi
     61 	    case $1 in
     62 		-e)
     63 		    pattern="$2"
     64 		    pattern_found=1
     65 		    shift 2
     66 		    break
     67 		    ;;
     68 		*)
     69 		    ;;
     70 	    esac
     71 	    grep_args="${grep_args} $1 $2"
     72 	    shift 2
     73 	    ;;
     74 	--)
     75 	    shift
     76 	    endofopts=1
     77 	    ;;
     78 	-)
     79 	    hyphen=1
     80 	    shift
     81 	    ;;
     82 	-h)
     83 	    silent=1
     84 	    shift
     85 	    ;;
     86 	-*)
     87 	    grep_args="${grep_args} $1"
     88 	    shift
     89 	    ;;
     90 	*)
     91 	    # pattern to grep for
     92 	    endofopts=1
     93 	    ;;
     94     esac
     95 done
     96 
     97 # if no -e option was found, take next argument as grep-pattern
     98 if [ ${pattern_found} -lt 1 ]
     99 then
    100     if [ $# -ge 1 ]; then
    101 	pattern="$1"
    102 	shift
    103     elif [ ${hyphen} -gt 0 ]; then
    104 	pattern="-"
    105     else
    106 	echo "${prg}: missing pattern" >&2
    107 	exit 1
    108     fi
    109 fi
    110 
    111 # call grep ...
    112 if [ $# -lt 1 ]
    113 then
    114     # ... on stdin
    115     ${zcat} -fq - | ${grep} ${grep_args} -- "${pattern}" -
    116 else
    117     # ... on all files given on the command line
    118     if [ ${silent} -lt 1 ]; then
    119 	grep_args="-H ${grep_args}"
    120     fi
    121     while [ $# -gt 0 ]
    122     do
    123 	${zcat} -fq -- "$1" | ${grep} --label="${1}" ${grep_args} -- "${pattern}" -
    124 	shift
    125     done
    126 fi
    127 
    128 exit 0
    129