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How do I print to more than one file at once?

by faq_monk (Initiate)
on Oct 13, 1999 at 03:42 UTC ( #810=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 only have to do this once, you can do this:

    for $fh (FH1, FH2, FH3) { print $fh "whatever\n" }

To connect up to one filehandle to several output filehandles, it's easiest to use the tee(1) program if you have it, and let it take care of the multiplexing:

    open (FH, "| tee file1 file2 file3");

Or even:

    # make STDOUT go to three files, plus original STDOUT
    open (STDOUT, "| tee file1 file2 file3") or die "Teeing off: $!\n";
    print "whatever\n"                       or die "Writing: $!\n";
    close(STDOUT)                            or die "Closing: $!\n";

Otherwise you'll have to write your own multiplexing print function -- or your own tee program -- or use Tom Christiansen's, at http://www.perl.com/CPAN/authors/id/TOMC/scripts/tct.gz, which is written in Perl and offers much greater functionality than the stock version.

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[marto]: erix unlikely, we've had posts within the last few minutes ;)
[ambrus]: nysus: make sure you enter at least two lines for the title and then preview, and read warnings the preview form prints
[davies]: There is an option (I have it set) to force preview before submission. Perhaps your option has been set (accidentally?) and you are not expecting it.
[ambrus]: sorry, I mean at least two words for the title and then preview
[ambrus]: davies: that option is the default. and it's not really "force", it just hides the button.
[marto]: yes, not reading the errors displayed has been a cause of this type of report in the past
[nysus]: Ambrus, ah. I think that was the problem. I'll try. Thanks!
[davies]: Ambrus: you've missed it by a couple of weeks, but consider next year's London Perl Workshop.

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