comm |
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comm [ options ... ] file1 file2 |
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To indicate which lines in the two input files are unique or common. |
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-1 |
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Do not print column one (lines unique to file1). |
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-2 |
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Do not print column two (lines unique to file2). |
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-3 |
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Do not print column three (lines common to both files). |
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Read the two files line by line. The input files must be sorted. Produce three columns of output: lines that are only in file1, lines that are only in file2, and lines that are in both files. Either filename can be -, in which case comm reads standard input. |
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The options are not intuitive; it is hard to remember to add an option in order to remove an output column! |
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