#!/usr/bin/perl

use strict;
 
my $logfile = $ARGV[0];
 
open STDOUT, "|-"
        or do {
                open LOG, ">> $logfile"
                        or die "Unable to open $logfile: $!\n";
 
                while (<STDIN>) { print, print LOG }
                
                close LOG, close STDOUT;
                exit;
        };
 
print "This is only a test.\n";