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    Read man comm. Commented Jun 13, 2021 at 18:00
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    Why trying to re-invert the wheel when "diff" and "comm" commands are readily available? Commented Jun 13, 2021 at 18:27
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    If you're asking why it only "echos 1..10" then remember IFS= read -r line && IFS= read -r line2 <&3 is only true if both reads succeed Commented Jun 13, 2021 at 18:50