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    Comparing files and list out the different value in output

    Dear all.
    Sorry to interrupt, but I do have no idea about this
    I am new developer in linux system
    so I would like you guys could give me a hand


    ok the question is
    a.txt > cat, dog, human, apple

    b.txt > cat apple

    comparing with a.txt and b.txt ………dog and human is missing on b.txt .. the output result list out : dog , humen … since b.txt is missing as comparing with a.txt

    How can i develop ?

    Thank you very much
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    Doug G
    I've never been able to appreciate the sublime arrogance of folks who feel they were put on earth just to save other folks from themselves .." - Donald Hamilton

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