Beefy Boxes and Bandwidth Generously Provided by pair Networks
We don't bite newbies here... much
 
PerlMonks  

How do I dup() a filehandle in Perl?

by faq_monk (Initiate)
on Oct 13, 1999 at 03:42 UTC ( #815=perlfaq nodetype: print w/replies, xml ) Need Help??

Current Perl documentation can be found at perldoc.perl.org.

Here is our local, out-dated (pre-5.6) version:

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

    open(LOG, ">>/tmp/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.

Log In?
Username:
Password:

What's my password?
Create A New User
Chatterbox?
[LanX]: I remeber M::S (it was dialog driven?) to be buggy
[stevieb]: As far as Dist::Zilla goes, I don't like installing that other than on systems my test platorm runs on. I find it too heavy. I prefer being able to glean a Makefile.PL
[LanX]: what's frustrating me is that a distribution has lots of dupplicated info
[stevieb]: LanX I don't know if it's dialog driven; I just use it in the simplest of terms (just run module-starter at the CLI, and the very last couple of lines are how I use it.
[stevieb]: which dist are you speaking of regarding dups, LanX?
[LanX]: readme version number and so on ...
[stevieb]: with M::S, you can also add other tags, but defaults work... such as --license=perl --eumm
[LanX]: I'm not a big fan of pure make, apparently the auto generated ones are so complicated to be able to work with all possible makes

How do I use this? | Other CB clients
Other Users?
Others wandering the Monastery: (4)
As of 2017-08-18 20:54 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    Who is your favorite scientist and why?



























    Results (310 votes). Check out past polls.

    Notices?