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[all variants] How to find gaps in a sequence of files ?

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linux-howto

http://ubuntuforums.org – I don't really know how to say it, so I'll give an example. I have a list of files in a directory that are named "PICT100xxxx.jpg", starting at "PICT1000100.jpg", and ending at "PICT1002661.jpg". There should be around 2562 files. There are about 150 missing. Is there a way to find the breaks in the sequence ? I was thinking to put the file list in a .txt file and then to parse it, with a perl routine, comparing each with previous. I have not written a line of code for the last 5 years ... Must be an easier way. Thanks (Hardware)