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 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

-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 © 2005 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

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.