http://www.perlmonks.org?node_id=874102


in reply to Re^3: Renaming an image file
in thread Renaming an image file

And what happens if the site where these images are being uploaded is, or becomes, a FaceBook or Flickr?

Or any site that has multiple upload servers; and/or uses threaded servers.

Now any scheme that tries to use upload time--even to the microsecond; and with or without combination with current pid--is almost guaranteed to create duplicates.

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Re^5: Renaming an image file
by mjscott2702 (Pilgrim) on Nov 28, 2010 at 14:12 UTC
    Fair and valid point - but much bigger context than OP had asked for. For such situations, probably a (multi-threaded) database solution would be the robust way to go. But probably overkill for a local, one-off solution.