If you are working with large files (or a large number of them) you might consider using File::Slurp
It is much fast than the conventional:
local $/ = undef;
open FILE, "myfile" or die "Couldn't open file: $!";
$string = <FILE>;
In my case it managed to decrease the runtime of my script from 40-45 minutes to 3 minutes.
Uri (the current maintainer of File-Slurp
) wrote a pretty exhaustive
article on slurping
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