FAQ 5.34 How do I dup() a filehandle in Perl?
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From: PerlFAQ Server on 25 Jun 2010 06:00 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 . -------------------------------------------------------------------- 5.34: 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 my $log, '>>', '/foo/logfile'; open STDERR, '>&LOG'; Or even with a literal numeric descriptor: my $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. -------------------------------------------------------------------- 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. |