UNIQ("1") manual page
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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
- -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’.
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 coreutils ’uniq invocation’
should give you access to the complete manual.
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