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UNIQ


Section: User Commands (1)
Updated: March 2014
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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}
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
-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’.
 

AUTHOR

Written by Richard M. Stallman and David MacKenzie.
 

REPORTING BUGS

Report uniq bugs to [email protected]

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

Copyright © 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.
 

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.



 

Index



NAME

SYNOPSIS

DESCRIPTION

AUTHOR

REPORTING BUGS

COPYRIGHT

SEE ALSO



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