uniq - Unix, Linux Command

NAME

uniq - report or omit repeated lines

SYNOPSIS

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

DESCRIPTION

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

Mandatory arguments to long options are mandatory for short options too.

Tag	Description
-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 © 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.