UNIQ(1) User Commands UNIQ(1)

NAME
       uniq - report or omit repeated lines

SYNOPSIS
       uniq [OPTION]... [INPUT [OUTPUT]]

DESCRIPTION
       Filter  adjacent matching lines from INPUT (or standard input), writing
       to OUTPUT (or standard output).

       With no options, matching lines are merged to the first occurrence.

       Mandatory arguments to long options are  mandatory  for  short  options
       too.

       -c, count
              prefix lines by the number of occurrences

       -d, repeated
              only print duplicate lines, one for each group

       -D, all-repeated[=METHOD]
              print  all duplicate lines groups can be delimited with an empty
              line METHOD={none(default),prepend,separate}

       -f, skip-fields=N
              avoid comparing the first N fields

       group[=METHOD]
              show  all  items,  separating  groups   with   an   empty   line
              METHOD={separate(default),prepend,append,both}

       -i, ignore-case
              ignore differences in case when comparing

       -s, skip-chars=N
              avoid comparing the first N characters

       -u, unique
              only print unique lines

       -z, zero-terminated
              end lines with 0 byte, not newline

       -w, check-chars=N
              compare no more than N characters in lines

       help display this help and exit

       version
              output version information and exit

       A field is a run of blanks (usually spaces and/or TABs), then non-blank
       characters.  Fields are skipped before chars.

       Note: 'uniq' does not detect repeated lines unless they  are  adjacent.
       You  may want to sort the input first, or use 'sort -u' without 'uniq'.
       Also, comparisons honor the rules specified by 'LCCOLLATE'.

       GNU  coreutils  online  help:  
       Report uniq translation bugs to 

AUTHOR
       Written by Richard M. Stallman and David MacKenzie.

COPYRIGHT
       Copyright  ©  2013  Free Software Foundation, Inc.  License GPLv3+: GNU
       GPL version 3 or later .
       This is free software: you are free  to  change  and  redistribute  it.
       There is NO WARRANTY, to the extent permitted by law.

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

       The  full documentation for uniq is maintained as a Texinfo manual.  If
       the info and uniq programs are properly installed  at  your  site,  the
       command

              info coreutils 'uniq invocation'

       should give you access to the complete manual.



GNU coreutils 8.22               October 2018                          UNIQ(1)