uniq(1)     UNIX System V(Directory and File Management Utilities)      uniq(1)


NAME
      uniq - report repeated lines in a file

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

DESCRIPTION
      uniq 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.  Input and output should always
      be different.  Note that repeated lines must be adjacent in order to be
      found; see sort(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.

SEE ALSO
      comm(1), sort(1).






















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