[OMC] Testing for a files existence… problem.

[OnMyCommand discussion]

Hi,

I'm working on a shell script that is basically swapping files.

I'm looking for a way to tell what file is missing from a certain  
directory and return it's name for use in a mv command.

Let's say I have a directory that should contain File1, File2, File3,  
but File2 is missing. What command would be good to use to tell me  
that File2 is missing?

Thanks!
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