faster

average 2-3 x
	for option -h or -q 10 x

handle option -q and -L

better exit status, similar to grep (0: matches found 1: no
matches found 2: error)

gnu/usr.bin/gzip/zgrep.getopt

@@ -0,0 +1,72 @@
+#!/bin/sh
+# (c) Wolfram Schneider, Berlin. April 1996.
+#
+# zgrep -  search possibly compressed files for a regular expression
+#
+# $Id: zgrep,v 1.4 1996/04/28 18:43:47 wosch Exp $
+
+
+PATH=/bin:/usr/bin:$PATH; export PATH
+
+# grep variant
+case "$0" in
+	*egrep)	grep=${EGREP-egrep}	;;
+	*fgrep)	grep=${FGREP-fgrep}	;;
+	*)	grep=${GREP-grep}	;;
+esac
+
+gzip=gzip gzipopt="-cdfq" pattern= grepopt= files= line= header=
+set -- `getopt "0123456789A:B:CEFGVX:bce:f:hiLlnqsvwxy" "$@"`
+
+# check options
+while :
+do
+	case "$1" in
+		--) 	shift; break;;			# EOF options
+		-e|-f) 	pattern="$1 $2"; shift;;	# -f file
+		-l|-L) 	line=$1; 	grepopt="$grepopt $1";;
+		-h|-q) 	header=$1; 	grepopt="$grepopt $1";;
+  		*) 			grepopt="$grepopt $1";;	# rest
+	esac
+	shift
+done
+
+# check pattern
+case X"$pattern" in
+	X) case $# in 
+		0) echo "usage: $0 [grep_options] pattern [files]"; exit 1;; 
+		*) pattern=$1; shift;;
+	   esac
+esac
+
+
+files="$@"	
+# no shell loop neccessary for option -q or -h 
+# and a single file or reading from stdin
+case "$header"X"$#" in 
+	-h*|-q*|X0|X1) 	$gzip $gzipopt $files | $grep $grepopt $pattern
+			exit $?;; 
+esac
+
+
+exit=1
+for f in $files
+do
+	case "$line" in
+		-l|-L) 	if $gzip $gzipopt $f | 
+				$grep $grepopt $pattern >/dev/null
+			then
+				echo $f
+			fi
+			;;
+		*) $gzip $gzipopt $f | $grep $grepopt $pattern | 
+			sed "s%^%${f}:%";;
+	esac
+
+	case $? in 
+		2) exit=$?;; 
+		0) case "$exit" in 2);; 1) exit=0;; esac;;
+	esac
+done
+
+exit $exit