`comm': Compare two sorted files line by line ============================================= `comm' writes to standard output lines that are common, and lines that are unique, to two input files; a file name of `-' means standard input. Synopsis: comm [OPTION]... FILE1 FILE2 Before `comm' can be used, the input files must be sorted using the collating sequence specified by the `LC_COLLATE' locale, with trailing newlines significant. If an input file ends in a non-newline character, a newline is silently appended. The `sort' command with no options always outputs a file that is suitable input to `comm'. With no options, `comm' produces three column output. Column one contains lines unique to FILE1, column two contains lines unique to FILE2, and column three contains lines common to both files. Columns are separated by a single TAB character. The options `-1', `-2', and `-3' suppress printing of the corresponding columns. Also see Note: Common options. Unlike some other comparison utilities, `comm' has an exit status that does not depend on the result of the comparison. Upon normal completion `comm' produces an exit code of zero. If there is an error it exits with nonzero status.
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