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     print all duplicate lines

   --all-repeated[=METHOD]
          like  -D,  but  allow  separating  groups  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
          line delimiter is NUL, 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 'LC_COLLATE'.

AUTHOR

   Written by Richard M. Stallman and David MacKenzie.

REPORTING BUGS

   GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
   Report uniq translation bugs to <http://translationproject.org/team/>

COPYRIGHT

   Copyright  2016 Free Software Foundation, Inc.   License  GPLv3+:  GNU
   GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
   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)

   Full documentation at: <http://www.gnu.org/software/coreutils/uniq>
   or available locally via: info '(coreutils) uniq invocation'

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Free and Open Source Software