Dave,
You could always just keep track of the filehandles yourself: 

#!/usr/bin/perl -w

use IO::File;
use strict;

my( %files, $ele1, $ele2, $ele3, $id, $fh );

while( <> ) {
        ($ele1, $ele2, $ele3, $id ) = split;
        $files{$id} = $fh = $files{$id} || openup( $id );
        print $fh $id, ":\t", $ele1, "\t", $ele2, "\t", $ele3, "\n";
}

sub openup {
        my( $filename ) = shift;
        my $fh = IO::File->new( $filename, "w" ) ||
                die "unable to open $filename ($!)\n";
        return $fh;
}

[download]

-derby

In reply to Re: Creating multiple output files by derby
in thread Creating multiple output files by Anonymous Monk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.