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    <p>If the files are not too big for memory, I would go with TLP's solution. If they are, you can modify it just a bit and print to a file as he suggests. Add this before the <code>while</code> (all untested, ymmv, caveat programmer, etc):</p> <pre><code>my $currentInFile = ""; my $currentOutFileHandle = ""; </code></pre> <p>And change the body of the <code>while</code> from the current <code>if-else</code> to</p> <pre><code>if ($currentInFile ne $ARG) { if (fileno($currentOutFileHandle)) { if (!close($currentOutFileHandle)) { # whatever you want to do if you can't close the previous output file } } my $newOutFile = $ARG . ".tagged"; if (!open($currentOutFileHandle, "&gt;", $newOutFile)) { # whatever you want to do if you can't open a new output file for writing } } if (...conditional from TLP...) { # add more zeroes if the files really are that large :) $lastkey = $1 . " " . sprintf("%0.10d", $.); } if (fileno($currentOutFileHandle)) { print $currentOutFileHandle $lastkey . "\t" . $line; } else { # whatever you want to do if $currentOutFileHandle's gone screwy } </code></pre> <p>Now you'll have a foo.log.tagged for each foo.log you fed it; the .tagged file contains exactly the contents of the original, but with "0xNNNNNNNN LLLLLLLLLL\t" (LLLLLLLLLL -> zero-padded line number) prepended to each line. <code>sort(1)</code> actually does a pretty good job of handling large data, though you'll want to look at the --temporary-directory argument if you think it will overflow /tmp with its temp files while chewing through the stuff you feed it. Something like this should get you started:</p> <pre><code>sort --output=/my/new/really.big.file --temporary-directory=/scratch/dir/on/roomy/partition *.tagged </code></pre> <p>Then trim away the tags if desired:</p> <pre><code>perl -pi -e 's/^[^\t]+\t//' /my/new/really.big.file </code></pre> <p>FWIW, I padded the line numbers to keep from having to worry about such things as line 10 sorting before line 2 if their hex keys were identical - since the hex numbers are the primary sort criterion, we can't just sort numerically.</p>
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