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man uniq 

UNIQ(1)				 User Commands			       UNIQ(1)


NAME
       uniq - report or omit repeated lines



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


DESCRIPTION
       Discard	all but one of successive identical lines from INPUT (or stan-
       dard input), writing to OUTPUT (or standard output).

       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}	Delimiting  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

       -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 whitespace, then non-whitespace characters.	Fields
       are skipped before chars.


AUTHOR
       Written by Richard Stallman and David MacKenzie.


REPORTING BUGS
       Report bugs to <bug-coreutils@gnu.org>.



COPYRIGHT
       Copyright (C) 2006 Free Software Foundation, Inc.
       This  is	 free  software.   You may redistribute copies of it under the
       terms	  of	  the	   GNU	    General	  Public       License
       <http://www.gnu.org/licenses/gpl.html>.	 There	is NO WARRANTY, to the
       extent permitted by law.


SEE ALSO
       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 uniq

       should give you access to the complete manual.

uniq 5.97			   May 2011			       UNIQ(1)
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