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    <p>First off, this piece of code causes the input file to be read once for every param. Which is quite in-efficient.</p> <pre><code>foreach $current_param (@param_name) { ... seek(INFILE,$data_start_pos,0); #Jump to data start while ($line = &lt;INFILE&gt;) { ... } ... } </code></pre> <p>Also there is very rarely a reason to use a <code>continue</code> block. This is more style / readability, then a real problem.</p> <hr> <p>Now on to make it more performant.</p> <p>I packed the sections individually, so that I could process a line exactly once. To prevent it from using up tons of RAM, I used <a href="http://perldoc.perl.org/File/Temp.html" rel="nofollow">File::Temp</a> to store the data until I was ready for it. Then I used <a href="http://perldoc.perl.org/File/Copy.html" rel="nofollow">File::Copy</a> to append those sections into the binary file.</p> <p>This is a quick implementation. If I were to add much more to it, I would split it up more than it is now.</p> <pre><code>#!/usr/bin/perl use strict; use warnings; use File::Temp 'tempfile'; use File::Copy 'copy'; use autodie qw':default copy'; use 5.10.1; my $input_filename = shift @ARGV; open my $input, '&lt;', $input_filename; my @param_names; my $template = ''; # stop uninitialized warning my @field_names; my $field_name_line; while( &lt;$input&gt; ){ chomp; next if /^\s*$/; if( my ($param) = /^\s*(.+?)\s+filter = ALL_VALUES\s*$/ ){ push @param_names, $param; }elsif( /^[\s-]+$/ ){ my @fields = split /(\s+)/; my $pos = 0; for my $field (@fields){ my $length = length $field; if( substr($field, 0, 1) eq '-' ){ $template .= "\@${pos}A$length "; } $pos += $length; } last; }else{ $field_name_line = $_; } } @field_names = unpack $template, $field_name_line; for( @field_names ){ s(^\s+){}; $_ = lc $_; $_ = 'type' if substr('type', 0, length $_) eq $_; } my %temp_files; for my $param ( @param_names ){ for(qw'time data'){ my $fh = tempfile 'temp_XXXX', UNLINK =&gt; 1; binmode $fh, ':raw'; $temp_files{$param}{$_} = $fh; } } my %convert = ( TXT =&gt; sub{ pack 'A*', join "\n", @_ }, D =&gt; sub{ pack 'd*', @_ }, UI =&gt; sub{ pack 'L*', @_ }, ); sub print_time{ my($param,$time) = @_; my $fh = $temp_files{$param}{time}; print {$fh} $convert{D}-&gt;($time); } sub print_data{ my($param,$format,$data) = @_; my $fh = $temp_files{$param}{data}; print {$fh} $convert{$format}-&gt;($data); } my %data_type; while( my $line = &lt;$input&gt; ){ next if $line =~ /^\s*$/; my %fields; @fields{@field_names} = unpack $template, $line; print_time( @fields{(qw'name time')} ); print_data( @fields{(qw'name type value')} ); $data_type{$fields{name}} //= $fields{type}; } close $input; open my $bin, '&gt;:raw', $input_filename.".bin"; open my $toc, '&gt;', $input_filename.".toc"; for my $param( @param_names ){ my $data_fh = $temp_files{$param}{data}; my $time_fh = $temp_files{$param}{time}; seek $data_fh, 0, 0; seek $time_fh, 0, 0; my @toc_line = ( $param, $data_type{$param}, 0+sysseek($bin, 0, 1) ); copy( $time_fh, $bin, 8*1024 ); close $time_fh; push @toc_line, sysseek($bin, 0, 1); copy( $data_fh, $bin, 8*1024 ); close $data_fh; push @toc_line, sysseek($bin, 0, 1); say {$toc} join ',', @toc_line, ''; } close $bin; close $toc; </code></pre>
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    1. COThanks for the input! I added what I have written so far before I saw your answer. I may try to incorporate using temp files to keep memory usage low. Some of the data files in theory could get pretty gigantic. I also updated the original post for a slightly better sample data file.
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    2. CO@AeroEngy I would like to find out how well this program works on the actual data. If your data easily fit's into RAM then this example might be a little overkill.
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