Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!mit-eddie!uw-beaver!milton!sumax!polari!thebes!camco!bill
From: bill@camco.Celestial.COM (Bill Campbell)
Newsgroups: comp.unix.shell
Subject: Re: does a zgrep exist? (zgrep <> zcat | grep)
Message-ID: <750@camco.Celestial.COM>
Date: 21 Feb 91 07:35:40 GMT
References: <BRISTER.91Feb14204903@saratoga.decwrl.dec.com> <1991Feb15.232854.13378@robobar.co.uk> <463@bria> <1991Feb18.075330.15536@convex.com>
Organization: Celestial Software, Mercer Island, WA
Lines: 101

>>It would be nice to grep through compressed files. Sure, you can do zcat |
>>grep regexp, but then you loose the ability of grep to tell you the
>>filename and/or linenumber of a match.  Uncompressing the files before
>>greping isn't really wanted, cause you may not have the space on disk.

>How quickly we forget!

A perl solution might well be:

while($file = shift) {
	$zcat = ($file =~ /\.Z$/ ? 'zcat' : $file =~ /\.z$/ ? 'pcat' : 'cat' );
	open(INPUT, "$zcat $file");
	while(<INPUT>) {
		print "$file:$_\n";
	}
	close(INPUT);
}
The one I actually use is:
#! /bin/sh
# This is a shell archive.  Remove anything before this line, then unpack
# it by saving it into a file and typing "sh file".  To overwrite existing
# files, type "sh file -c".  You can also feed this as standard input via
# unshar, or by typing "sh <file", e.g..  If this archive is complete, you
# will see the following message at the end:
#		"End of shell archive."
# Contents:  zgrep
# Wrapped by bill@camco on Wed Feb 20 23:34:27 1991
PATH=/bin:/usr/bin:/usr/ucb ; export PATH
if test -f 'zgrep' -a "${1}" != "-c" ; then 
  echo shar: Will not clobber existing file \"'zgrep'\"
else
echo shar: Extracting \"'zgrep'\" \(857 characters\)
sed "s/^X//" >'zgrep' <<'END_OF_FILE'
X:
X# Header: %Z% %M%	Version %I% %H% %T% %Z%
X# exec [e|f]grep on a series of .Z files
X
Xprogname=`basename $0`
XUSAGE="Usage: $progname [-v] [-e environment]"
Xset -- `getopt FEvxclhnbsye: $*`
Xif [ $? != 0 ]
Xthen
X	echo $USAGE
X	exit 2
Xfi
Xsuffix=$$
Xtmpenv=/tmp/tmpenv$suffix
X> $tmpenv
Xopts=''
Xfor i in $*
Xdo
X	case $i in
X		-F)	prefix=f
X			shift;;
X		-E)	prefix=e
X			shift;;
X		-[vxclhnbsy])
X			opts="$opts $1"
X			shift 1;;
X		-e)
X			opts="$opts -e $2"
X			shift 2 ;;
X		--)	shift;
X			break
X			;;
X	esac
Xdone
X. $tmpenv	# set any environment variables
Xrm $tmpenv
X
Xopts="$opts '$1'"
Xshift
X
Xif [ $# != 1 ]
X	then multi=true
X	else multi=''
Xfi
Xfor file do
X	case "$file" in
X		*.z)	cat=pcat;;
X		*.Z)	cat=zcat;;
X		*)		cat=cat;;
X	esac
X	if [ "$multi" != "" ]
X		then eval "$cat $file | ${prefix}grep $opts" | sed "s;^;$file:;"
X		else eval "$cat $file | ${prefix}grep $opts"
X	fi
Xdone
END_OF_FILE
if test 857 -ne `wc -c <'zgrep'`; then
    echo shar: \"'zgrep'\" unpacked with wrong size!
fi
chmod +x 'zgrep'
# end of 'zgrep'
fi
echo shar: End of shell archive.
exit 0
-- 
INTERNET:  bill@Celestial.COM   Bill Campbell; Celestial Software
UUCP:   ...!thebes!camco!bill   6641 East Mercer Way
             uunet!camco!bill   Mercer Island, WA 98040; (206) 947-5591


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