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Linux 2.6 - man page for uniq (linux section 1)

UNIQ(1) 				  User Commands 				  UNIQ(1)

       uniq - report or omit repeated lines

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

       Filter adjacent matching lines from INPUT (or standard input), writing to OUTPUT (or stan-
       dard 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

       -D, --all-repeated[=delimit-method]
	      print all duplicate lines delimit-method={none(default),prepend,separate}  Delimit-
	      ing is done with blank lines

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

       -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

	      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'.

       Written by Richard M. Stallman and David MacKenzie.

       Report uniq bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>
       Report uniq translation bugs to <http://translationproject.org/team/>

       Copyright (C) 2010 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.

       comm(1), join(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 8.5			  February 2011 				  UNIQ(1)

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