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How do I dup() a filehandle in Perl?

Jasmine
Administrator

Jan 26, 2001, 10:40 AM

Post #1 of 1 (2005 views)

How do I dup() a filehandle in Perl?	Can't Post

(From the Perl FAQ)

How do I dup() a filehandle in Perl?

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

Code

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

Or even with a literal numeric descriptor:

Code

   $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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