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    Devshed Newbie (0 - 499 posts)

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    hello all, I have an input file with four columns like this with a lot of lines 2GOX03.
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  3. Sarcky
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    Welcome to the forums. Please read the forum rules and expand upon your question so it makes sense.
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    Devshed God 1st Plane (5500 - 5999 posts)

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    Learn gawk. (awk, nawk you'll have some flavor available to you)

    sort | uniq
    removes duplicate lines but may change the order of lines.

    If you want to discard lines with a duplicate column entry gawk is quite good for this. If the other columns differed how would you merge them?

    Suppose lines 3 and 6 have duplicate column 3 entries, and you want therefor neither line 3 nor line 6. gawk is good for this too.

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