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#!/bin/sh
# bzgrep -- a wrapper around a grep program that decompresses files as needed
# Adapted from zgrep of the Debian gzip package by Anibal Monsalve Salazar.
# Adapted from a version sent by Charles Levert <charles@comm.polymtl.ca>
# Copyright (C) 1998, 2001, 2002 Free Software Foundation
# Copyright (C) 1993 Jean-loup Gailly
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.
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=""
after_dash_dash=""
files_with_matches=0
files_without_matches=0
no_filename=0
with_filename=0
while test $# -ne 0; do
case "$after_dash_dash$1" in
--d* | --rec*) echo >&2 "$0: $1: option not supported"; exit 2;;
--files-with-*) files_with_matches=1;;
--files-witho*) files_without_matches=1;;
--no-f*) no_filename=1;;
--wi*) with_filename=1;;
--*) ;;
-*)
case "$1" in
-*[dr]*) echo >&2 "$0: $1: option not supported"; exit 2;;
esac
case "$1" in
-*H*) with_filename=1;;
esac
case "$1" in
-*h*) no_filename=1;;
esac
case "$1" in
-*L*) files_without_matches=1;;
esac
case "$1" in
-*l*) files_with_matches=1;;
esac;;
esac
case "$after_dash_dash$1" in
-[ef]) opt="$opt $1"; shift; pat="$1"
if test "$grep" = grep; then # grep is buggy with -e on SVR4
grep=egrep
fi;;
-[ABCdm])opt="$opt $1 $2"; shift;;
--) opt="$opt $1"; after_dash_dash=1;;
-*) opt="$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 2
fi
if test $# -eq 0; then
bzip2 -cdfq | $grep $opt "$pat"
exit $?
fi
res=0
for i do
if test -f "$i"; then :; else if test -f "$i.bz2"; then i="$i.bz2"; fi; fi
bzip2 -cdfq -- "$i" |
if test $files_with_matches -eq 1; then
$grep $opt "$pat" > /dev/null && printf "%s\n" "$i"
elif test $files_without_matches -eq 1; then
$grep $opt "$pat" > /dev/null || printf "%s\n" "$i"
elif test $with_filename -eq 0 && { test $# -eq 1 || test $no_filename -eq 1; }; then
$grep $opt "$pat"
else
i=$(echo "$i" | sed -e 's/[\\|&]/\\&/g')
if test $with_filename -eq 1; then
sed_script="s|^[^:]*:|${i}:|"
else
sed_script="s|^|${i}:|"
fi
# Hack adapted from GPLed code at
# https://groups.google.com/forum/#!original/comp.unix.shell/x1345iu10eg/Nn1n-1r1uU0J
# Has the same effect as the following two lines of bash:
#
# $grep $opt "$pat" | sed "$sed_script"
# exit ${PIPESTATUS[0]}
#
# Inside the `...`, fd4 goes to the pipe whose other end is read
# and passed to eval; fd1 is the normal standard output
# preserved the line before with exec 3>&1
exec 3>&1
eval `
exec 4>&1 >&3 3>&-
{
$grep $opt "$pat" 4>&-; echo "r=$?;" >&4
} | sed "$sed_script"
`
exit $r
fi
r=$?
test $res -lt $r && res=$r
done
exit $res
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