in reply to Remove line above matching criteria

You haven't shown us what you have tried so far, nor what your criteria for "best" are (fastest, least memory, simplest, etc). We cannot easily help you if you don't do your homework first.

From what you've given us, I'd egrep -v the data from the command line and skip perl altogether ...

The intelligent reader will judge for himself. Without examining the facts fully and fairly, there is no way of knowing whether vox populi is really vox dei, or merely vox asinorum. — Cyrus H. Gordon

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Re^2: Remove line above matching criteria
by kwaping (Priest) on Nov 20, 2006 at 17:48 UTC
    If you're going to go that route, you can also (with GNU grep, at least) grep -B 1 '<id:>' to get the ID line together with the previous line.

    It's all fine and dandy until someone has to look at the code.