I believe this to be a duplicated question on stackoverflow, in which case I believe this to be the code inside the {do something..} found on stackoverflow...Hopefully having the actual code within your loop posted here may help you get an answer to your problem, hope this helps...

$line=0;
%values;
open my $fh1, '<', "file.xml" or die $!;
while (<$fh1>)
{
$line++;
if ($_=~ s/foo//gi)
{
    chomp $_;
    $values{'id'} = $_;
}
elsif ($_=~ s/foo//gi)
{
    chomp $_;
    $values{'type'} = $_;
}
elsif ($_=~ s/foo//gi)
{
    chomp $_;
    $values{'pattern'} = $_;
}
if (keys(%values) == 3)
{
    open FILE, ">>temp.txt" or die $!;
    print FILE "$values{'id'}\t$values{'type'}\t$values{'pattern'}\n";
    close FILE;
    %values = ();
}
if($line == ($line1+1000000))
{
    $line1=$line;
    $read_time = time();
    $processing_time = $read_time - $start_time - $processing_time;
    print "xml file parsed till line $line, time taken $processing_tim
+e sec\n";
}
}

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In reply to Re: How does the while works in case of Filehandle when reading a gigantic file in Perl by perloHolic()
in thread How does the while works in case of Filehandle when reading a gigantic file in Perl by raj4489

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