So I want to loop through the log for each one of those, find it and capture the "next" line after it.

Are the lines which can match the ids in the same order as the ids? To each id does correspond a unique matching line? How many are the ids? (This can make a difference - since you print them, I suppose they're not too many.) Are they all in this form? (i.e. a capital letter followed by five numbers.) Can the "next" line also match one id, or is this impossible a priori?

In reply to Re^3: Search a file with ids from another file by blazar
in thread Search a file with ids from another file by sigzero

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