#!/usr/bin/perl

use strict;
use warnings;
use PerlIO::gzip;

my $Usage = "Usage: $0 filename-to-compress\n";
die $Usage unless ( @ARGV == 1 and -f $ARGV[0] );

open( IN, "<", $ARGV[0] ) or die "$ARGV[0]: $!\n";
open( GZIP, ">:gzip", "$ARGV[0].gz" ) or die "$ARGV[0].gz: $!\n";

$/ = undef;
$_ = <IN>;
print GZIP;


##</code><code>##

# $/ = undef;
# leave $/ at it's default value...

while (<IN>) {
    print GZIP;
}