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Perl Style: Break Programs into Separate Processes

  • Learn how to use the special forms of open. (See also tgent in TSA).

        # from PCB 16.5
        head(100);
        sub head {
            my $lines = shift || 20;
            return if $pid = open(STDOUT, "|-");
            die "cannot fork: $!" unless defined $pid;
            while (<STDIN>) {
                print;
                last if --$lines < 0;
            }
            exit;
        }
    

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Copyright © 1998, Tom Christiansen All rights reserved.

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