Hmmm.. I did say there was plenty of room for improvement, after all, obviously shell scripting is more prone to failure than a proper program in C but let's give it a shot:
You're barking up the wrong tree. You can't do this securely (i.e., without race conditions) without using a procedure similar to that outlined by Rusell Coker. *Any* time you do a stat operation of some sort to check permissions before doing something dangerous you are starting a race. A malicious party will win the race eventually if you give them enough opportunity (e.g., a cron job).
Mike Stone
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