32v 1m uniq

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UNIQ(1) UNIX Programmer's Manual UNIQ(1)


    uniq - report repeated lines in a file


    uniq [ -udc [ +n ] [ -n ] ] [ input [ output ] ]


    _U_n_i_q reads the input file comparing adjacent lines.  In the
    normal case, the second and succeeding copies of repeated
    lines are removed; the remainder is written on the output
    file.  Note that repeated lines must be adjacent in order to
    be found; see _s_o_r_t(1).  If the -u flag is used, just the
    lines that are not repeated in the original file are output.
    The -d option specifies that one copy of just the repeated
    lines is to be written.  The normal mode output is the union
    of the -u and -d mode outputs.
    The -c option supersedes -u and -d and generates an output
    report in default style but with each line preceded by a
    count of the number of times it occurred.
    The _n arguments specify skipping an initial portion of each
    line in the comparison:
    -_n      The first _n fields together with any blanks before
            each are ignored.  A field is defined as a string of
            non-space, non-tab characters separated by tabs and
            spaces from its neighbors.
    +_n      The first _n characters are ignored.  Fields are
            skipped before characters.


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