Correct. If that 1 in 2128 possibility bothers you there's always Digest::SHA1 for 1 in 2160. Or keep a DBM mapping of "path" to hash and check for collisions when adding a new "path" entry.

Update: Left out the chance of collision for SHA1.

In reply to Re^3: Automatically distributing and finding files in subdirectories by Fletch
in thread Automatically distributing and finding files in subdirectories by myuserid7

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