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CentOS 7.0 - man page for uniq (centos section 1)

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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 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, 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={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
	      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 'LC_COLLATE'.

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

AUTHOR
       Written by Richard M. Stallman and David MacKenzie.

COPYRIGHT
       Copyright (C) 2013 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)

       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			    June 2014					  UNIQ(1)
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