4.3BSD - /usr/man/cat1/uniq.0

UNIQ(1)                                                                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.  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
       sort(1), comm(1)


7th Edition                     April 29, 1985                         UNIQ(1)