I don’t do this stuff for a living so forgive me if it’s a simple question (or more complicated than I think). I‘ve been digging through the archives and found a lot of tips that are close but being a novice I’m not sure how to tweak for my needs or they are way beyond my understanding.

I have some large data files that I can parse out to generate a list of coordinate that are mostly sequential

5
6
7
8
15
16
17
25
26
27

What I want is a list of the gaps

1-4
9-14
18-24

I don’t know perl, SQL or anything fancy but thought I might be able to do something that would subtract one number from the next. I could then at least grep the output where the difference was not 1 or -1 and work with that to get the gaps.

bash awk
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