#!/usr/local/bin/perl
use strict ;
use warnings ;
use Compress::Zlib ;
die "Usage: gzgrep pattern file...\n"
    unless @ARGV >= 2;
my $pattern = shift ;
my $file ;
foreach $file (@ARGV) {
    my $gz = gzopen($file, "rb")
         or die "Cannot open $file: $gzerrno\n" ;
    while ($gz->gzreadline($_) > 0) {
        print if /$pattern/ ;
    }
    die "Error reading from $file: $gzerrno\n"
        if $gzerrno != Z_STREAM_END ;
    $gz->gzclose() ;
}