does a zgrep exist? (zgrep <> zcat | grep)

[Chris Lewis]

In article <1991Feb15.232854.13378 at robobar.co.uk> ronald at robobar.co.uk (Ronald S H Khoo) writes:
>brister at decwrl.dec.com (James Brister) writes:
>
>> 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.

>Well, if you have it, zcat | grep regexp /dev/stdin would do what you wanted.
>If you can't hack a /dev/stdin driver into your kernel, then as an alternative
>you could modify grep to understand "-" as a filename.

Another approach is some variation (as in, this is untested, but
the algorithm's okay) on:
	pat=$1
	shift
	for i
	do
	    case $i in
		*.Z)
		    zcat $i | grep -n "$pat"
		    ;;
		*)
		    grep -n "$pat" $i
		    ;;
	    esac | sed -e 's/^/'$i': /'
	done
		    
-- 
Chris Lewis, Phone: (613) 832-0541, Internet: clewis at ferret.ocunix.on.ca
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