Hi,

open the file before you enter the while loop 

#!/usr/bin/perl -w

use strict;
use IO::File;

my $out_fh = IO::File->new(">>/tmp/output.log");
die "failed to open /tmp/output.log" unless defined $out_fh;

my $ref_db = FastaDb->new($fasta);
while( my $seq = $ref_db->next_seq() ) {
        foreach(@ko_array) {
                print $out_fh $seq->header()."\n".$seq->seq()."\n"
                        if $seq->header() =~ m/($_)/;
        }
}

$out_fh->close;

[download]

Update: I did fail to notice that you are generating the file name within the loop .

Ken's example of storing open file handles is the way to go.

Back to zzzzzzzzzzzzzzzzzz for me!!

In reply to Re: Write to multiple files by kielstirling
in thread Write to multiple files by julio_514

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.