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  • Does it need to be data[$1]=1; next? Wouldn't just data[$1]; next be sufficient? Commented Mar 9, 2020 at 13:09
  • @guest Possibly, if you're tired of typing, yes. I think that should work, but as I'm not 100% certain it works everywhere I opted for setting a value. Commented Mar 9, 2020 at 13:12
  • I'm sorry sir, i think my question is a bit wrong, should i change the main post? file A.txt and B.txt content does not have the same line number, and means a.txt record may be in random position. i tried your solution but it did'nt work, apparently FNR==NR compare if the record is on the same line am i right? any ways thanks Commented Mar 9, 2020 at 13:16
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    Thanks so much sir with detailed explanation as well, i tried doing many days already by searching around the forum, but still can't make it the way i want, and yours only using one line :D Guess i did learn something here and there, glad i ask a question here, it solved instantly.. Commented Mar 9, 2020 at 13:46
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    @guest - yes, data[$1]; next is all you need and will work in any awk. Using data[$1]=1 may just take up more memory, depending on how the arrays are implemented. Commented Mar 10, 2020 at 18:49