Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help 
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={sepa-
	    rate(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
     Report bugs to: bug-coreutils@gnu.org
     GNU coreutils home page: <https://www.gnu.org/software/coreutils/>
     General help using GNU software: <https://www.gnu.org/gethelp/>
     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 9.9		  November 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+15.1.quarterly>

home | help