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1.1     ! root        1: .pa 1
        !             2: .he 'UNIQ (I)'12/1/72'UNIQ (I)'
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        !             4: NAME           uniq -- report repeated lines in a file
        !             5: .sp
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        !             7: SYNOPSIS       uniq____ [ -ud___ ]  [ input [ output ] ]
        !             8: .sp
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        !            10: DESCRIPTION    uniq____
        !            11: reads the input
        !            12: file comparing adjacent lines.
        !            13: In the normal case, the second and succeeding copies
        !            14: of repeated lines are
        !            15: removed; the remainder is written on the output file.
        !            16: Note that repeated lines must be adjacent
        !            17: in order to be found.
        !            18: (See sort(I))
        !            19: If the -u__ flag is used,
        !            20: just the lines that are not repeated
        !            21: in the original file are output.
        !            22: The -d__ option specifies that
        !            23: one copy of just the repeated lines is to
        !            24: be written.
        !            25: Note that the normal mode output is the union of the
        !            26: -u__ and -d__ mode outputs.
        !            27: .sp
        !            28: The following example will print one copy of all
        !            29: lines in the file a_ that do not occur in b_:
        !            30: .sp
        !            31:        sort a x
        !            32:        uniq x a1
        !            33:        sort b x
        !            34:        uniq x b1
        !            35:        cat a1 b1 >x
        !            36:        sort x
        !            37:        uniq -u x >>a1
        !            38:        sort a1
        !            39:        uniq -d a1
        !            40: .sp
        !            41: .ti 0
        !            42: FILES          --
        !            43: .sp
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        !            45: SEE ALSO       sort(I)
        !            46: .sp
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        !            48: DIAGNOSTICS    "cannot open input", "cannot create output"
        !            49: .sp
        !            50: .ti 0
        !            51: BUGS           --

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