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tarakaramji has asked for the wisdom of the Perl Monks concerning the following question:

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Re: to read particular lines
by thezip (Vicar) on May 30, 2012 at 20:30 UTC

    Let me format this for you, with some recoding as well.

    Update:

    This probably won't work for you since I wasn't sure what your input data looked like. My assumption was that it was multi-space delimited, but as I re-read your spec, it might have the actual labels interspersed in there.

    Perhaps you could include some sample data to clear this up?


    use strict;
use warnings;
use autodie; 


my $length;
my $file = 'the filename...';

open(my $fh, '<', $file) || die "cant open file\n"; 
while (<$fh>) {
  chomp; 
  my($target, $mirna, $score, $start) = split(/\s+/);
  print join("\t", $mirna, $target, $start, $score), "\n";
  $length = $.;
}
close $fh;

    [download]

    This is the code i have written for which the output is:

    miR156a AT3G19833 151 0.607541 
miR156a AT3G19883 11 0.607541 
miR156a AT3G19883 12 0.607541 
miR156a AT3G19773 15 0.607541 
miR156a AT3G19833 161 0.607541
miR156a AT3G19780 163 0.607541

    [download]

    I haven't tested this, and this might not work exactly as you need it to, but I think it avoids some of the problems you might have had in your version.


    What can be asserted without proof can be dismissed without proof. - Christopher Hitchens, 1949-2011
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