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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
- -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-coreutils@gnu.org>.
Copyright © 2004
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.
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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