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prev seems to magically appear where you say print prev, but where do you assign its contents?

Is it somehow defaulting to $0 ?

AMAZING!

Thank you, that works!

I wish I could learn AWK, I know it's really powerful. I've coded in many different languages and can usually work out what stuff does, but AWK is so cryptic!
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I've been a Unix admin for nearly 30 years and never learned AWK. I've seen several similar posts here, but haven't been able to adapt the answers to my situation. AWK is so damn cryptic! ;)

I...