Perl Guru Forums: Perl Programming Help: Frequently Asked Questions: How do I dup() a filehandle in Perl?

CGI/Perl Guide | Learning Center | Forums | Advertise | Login

Site Search: in


	MAIN INDEX	SEARCH POSTS	WHO'S ONLINE	LOG IN

Home: Perl Programming Help: Frequently Asked Questions:
How do I dup() a filehandle in Perl?

Jasmine
Administrator

Jan 26, 2001, 10:40 AM

Post #1 of 1 (2576 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.

Search for (options)

Web Applications & Managed Hosting Powered by Gossamer Threads
Visit our Mailing List Archives