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    Your grep approach has no drawbacks. Just pipe it to paste 3 lines at a time and delimited by space and voila you get the desired output. Commented May 28, 2021 at 23:22
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    Infact it is theperl approach that is needlessly wieldy. You could just as well have written: perl -lne '$,=$"; print /(?=.*(?:^|\h)Inventory\h+for\h+(\S+)) (?=.*(?:^|\h)PID:\h+([^,]*),) (?=.*(?:^|\h)SN:\h+(\S{11})) /xg; ' file Commented May 28, 2021 at 23:24
  • @guest_7 your perl is great. I will be glad to you if you post it as an answers, with explanation comment Commented May 28, 2021 at 23:46
  • @guest_7 it has the one drawback that it requires GNU grep for -P and so, like the perl solution, won't be available on all Unix systems. Commented May 29, 2021 at 12:27
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    @YetAnotherUser that's absolutely fine, of course, I was just responding to guest_7 saying it has "no drawbacks" when in fact it has that one at least that perl isn't a mandatory POSIX tool, and the POSIX version of grep doesn't support -P and so those won't be available on all Unix boxes. Commented May 31, 2021 at 11:34