Section: User Commands (1)
Updated: October 2008
Sommaire  

uniq - report or omit repeated lines  

uniq [OPTION]... [INPUT [OUTPUT]]  

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.

-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 whitespace, then non-whitespace 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'.  

Written by Richard Stallman and David MacKenzie.  

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

Copyright © 2008 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.  

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.

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