This is just a thought, but I think that you could use the Tie::File module for this purpose.

You could tie the output file to an array, and then use something like this: 

$array[2] .= 'B';

[download]

This will append 'B' to the second line of the output file. The documentation states, that the file is not loaded into memory, so this will work even for gigantic files.

regards,
Luke Jefferson

In reply to Re: write to/append a specific line in output file by blindluke
in thread write to/append a specific line in output file by aquinom

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