I plead innocent on both counts.

I wrote the program so it would work for any incrementing filenames, such as:

• bar0.jpg, bar1.jpg, ..., bar50.jpg
• bar000.jpg, bar001.jpg, ..., bar050.jpg
• or even: barA.jpg, barB.jpg, ..., barZ.jpg
  (although that one's just a fortunate coincidence of using the range operator :)

I guess that may not be what sharle intended, but it makes the program so much more useful!

As for the other parts of the filename, those are the first and second arguments to the program.

P.S. Heh, yours is a program. Very sneaky of you! :)