What do you mean "we"? This is written for a single-user on a stand-alone pc or something. Unless you're using the "royal 'we'", you might want to add file locking to the read and write subs.

Aside from that, I like the look of it as-is. I do agree with Juerd about the wisdom of using existing modules, but if a problem is easy to solve with your own code, you're entitled to spend your time solving it for yourself if you want, rather than spenging your time to locate (install if necessary) and learn someone else's abstraction for solving a problem (which might not be exactly the same problem as yours, anyway). ++!