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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     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.

       'uniq'  does  not  detect repeated lines	unless they are	adjacent.  You
       may want	to sort	the input first, or use	'sort -u' without 'uniq'.

AUTHOR
       Written by Richard M. Stallman and David	MacKenzie.

REPORTING BUGS
       GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
       Report any translation bugs to <https://translationproject.org/team/>

COPYRIGHT
       Copyright (C) 2025 Free Software	Foundation, Inc.  License GPLv3+:  GNU
       GPL version 3 or	later <https://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 <https://www.gnu.org/software/coreutils/uniq>
       or available locally via: info '(coreutils) uniq	invocation'

GNU coreutils 9.6		 January 2025			       UNIQ(1)

Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=guniq&sektion=1&manpath=FreeBSD+Ports+14.3.quarterly>

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