I'm not quite sure what you mean by the size of a directory.
If what you want is the actual byte size of the directory
itself, you can just do
$size = (-s $directory);
If what you mean by size is the size of everything within
it, you'll probably have to code something up by hand,
preferably using
File::Find to handle your recursion. I
did a quick look on CPAN, but was unable to find any modules
to handle disk usage.
If you do want the size of everything in the directory, and
you're on unix, you can mess around with playing with the
output of the system command 'du', but I don't recommend
this for any script that will have a long life.
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