UNIQ(1)                              SysV                              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).