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Posted by PerlFAQ Server on June 3, 2008, 9:03 am
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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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5.33: 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 = $ENV;
open(MHCONTEXT, "<&=$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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