#!/usr/bin/env perl

use v5.14;

tee("/tmp/foo", "/tmp/bar", "/tmp/glarch");

while (<>) {
        print "$ARGV at line $. => $_";
}

close(STDOUT) || die "can't close STDOUT: $!";

sub tee {
        my @output = @_;
        my @handles = ();
        for my $path (@output) {
                my $fh; # open will fill this in
                unless (open ($fh, ">", $path)) {
                        warn "cannot write to $path: $!";
                        next;
                }
                push @handles, $fh;
        }
        # reopen STDOUT in parent and return
        return if my $pid = open(STDOUT, "|–");
        print "\$pid is : $pid";
        die "cannot fork: $!" unless defined $pid;
        # process STDIN in child
        while (<STDIN>) {
                for my $fh (@handles) {
                print $fh $_ || die "tee output failed: $!";
                }
        }
        for my $fh (@handles) {
                close($fh) || die "tee closing failed: $!";
        }
        exit; # don't let the child return to main!
}
[download]

# page 535 in book Programming Perl

when I run this in ubuntu shell but there is an error:

cannot fork: no such file or directory at ./tf6.pl line 27.

why? somebody give some advice.thanks.