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Perl Programming Language

FAQ 5.32 How do I dup() a filehandle in Perl?


This is an excerpt from the latest version perlfaq5.pod, which
comes with the standard Perl distribution. These postings aim to
reduce the number of repeated questions as well as allow the community
to review and update the answers. The latest version of the complete
perlfaq is at http://faq.perl.org .

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5.32: How do I dup() a filehandle in Perl?

    If you check "open" in perlfunc, you'll see that several of the ways to
    call open() should do the trick. For example:

            open(LOG, ">>/foo/logfile");
            open(STDERR, ">&LOG");

    Or even with a literal numeric descriptor:

       $fd = $ENV{MHCONTEXTFD};
       open(MHCONTEXT, "<&=$fd");   # like fdopen(3S)

    Note that "<&STDIN" makes a copy, but "<&=STDIN" make an alias. That
    means if you close an aliased handle, all aliases become inaccessible.
    This is not true with a copied one.

    Error checking, as always, has been left as an exercise for the reader.

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The perlfaq-workers, a group of volunteers, maintain the perlfaq. They
are not necessarily experts in every domain where Perl might show up,
so please include as much information as possible and relevant in any
corrections. The perlfaq-workers also don't have access to every
operating system or platform, so please include relevant details for
corrections to examples that do not work on particular platforms.
Working code is greatly appreciated.

If you'd like to help maintain the perlfaq, see the details in
perlfaq.pod.

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