uniq

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uniq

NAME

uniq - remove duplicate lines from a sorted file

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
-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.

Written by Richard Stallman and David MacKenzie.

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

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Copyright © 2003 by The Free Software Foundation	Updated Jun 2003