uniq(1)

NAME
     uniq - delete consecutive identical lines in a file

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

OPTIONS

     -c   Give count of identical lines in the input

     -d   Only duplicate lines are written to output

     -u   Only unique lines are written to output

     -n   Skip the first n columns when matching

     +n   Skip the first n fields when matching

EXAMPLES

     uniq +2 file        # Ignore first 2 fields when comparing

     uniq -d inf outf    # Write duplicate lines to outf

DESCRIPTION

     Uniq examines a file for consecutive lines that are identical.   All  but
     duplicate entries are deleted, and the file is written to output.  The +n
     option skips the first n fields, where a field is defined  as  a  run  of
     characters  separated  by  white  space.  The -n option skips the first n
     spaces.  Fields are skipped first.

SEE ALSO
     sort(1).