Thanks for reading this: I appreciate your time.

I'm trying to do something that should be very easy to do, and yet I can't remember how to do it, and I'm asking for help.

I have an alpha-numeric, sorted file, that looks like this:

01AA

01AB

01AC

01AE

01AF

.. etc.

I'm trying to remember what BASH utility, script, orĀ  command would flag the missing value (in this case, "01AD"). There are, of course, any number of ways to program a solution, but I can't remember which of the BASH utilities will do it. All suggestion welcome, and thanks in advance.

Bill Horne

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