uniq
(1g)
Name
uniq - report or omit repeated lines
Synopsis
uniq [OPTION]... [INPUT [OUTPUT]]
Description
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
-D, --all-repeated[=delimit-method]
print all duplicate lines
delimit-method={none(default),prepend,separate} Delim-
iting 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
--version
output version information and exit
GNU coreutils 8.16 Last change: March 2012 1
User Commands UNIQ(1)
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'.
AUTHOR
Written by Richard M. Stallman and David MacKenzie.
REPORTING BUGS
Report uniq bugs to bug-coreutils@gnu.org
GNU coreutils home page: <http://www.gnu.org/software/core-
utils/>
General help using GNU software: <http://www.gnu.org/geth-
elp/>
Report uniq translation bugs to <http://translationpro-
ject.org/team/>
COPYRIGHT
Copyright (C) 2012 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 redis-
tribute it. There is NO WARRANTY, to the extent permitted
by law.
ATTRIBUTES
See attributes(5) for descriptions of the following
attributes:
+---------------+--------------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+--------------------+
|Availability | file/gnu-coreutils |
+---------------+--------------------+
|Stability | Uncommitted |
+---------------+--------------------+
SEE ALSO
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 8.16 Last change: March 2012 2
User Commands UNIQ(1)
NOTES
This software was built from source available at
https://java.net/projects/solaris-userland. The original
community source was downloaded from
http://ftp.gnu.org/gnu/coreutils/coreutils-8.16.tar.xz
Further information about this software can be found on the
open source community website at http://www.gnu.org/soft-
ware/coreutils/.
GNU coreutils 8.16 Last change: March 2012 3