I very rarely code once run scripts.
Rather, I very rarely code as though the scripts will be run once (as most of my scripts are run only once).
Hrm, let me clarify. For example, in a script like the above I would probably start with the absolute path, get it working using that, then switch that to $ARGV[0]. Why? So that the next time that I need to write something similar, though not quite exactly the same, it's there for me with very little modification.

This is of course more do to laziness. Code always gets reused in my (small) experience. Even if it's not the whole thing, at least you've got something you can snag bits out of.

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