UNIQ(1) User Commands UNIQ(1)
uniq - report or omit repeated lines
uniq [OPTION]... [INPUT [OUTPUT]]
Filter adjacent matching lines from INPUT (or standard input), writing
to OUTPUT (or standard output).
With no options, matching lines are merged to the first occurrence.
Mandatory arguments to long options are mandatory for short options
prefix lines by the number of occurrences
only print duplicate lines, one for each group
print all duplicate lines groups can be delimited with an empty
avoid comparing the first N fields
show all items, separating groups with an empty line
ignore differences in case when comparing
avoid comparing the first N characters
only print unique lines
end lines with 0 byte, not newline
compare no more than N characters in lines
--help display this help and exit
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'.
Also, comparisons honor the rules specified by 'LC_COLLATE'.
GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
Report uniq translation bugs to <http://translationproject.org/team/>
Written by Richard M. Stallman and David MacKenzie.
Copyright (C) 2013 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.
comm(1), join(1), sort(1)
The full documentation for uniq is maintained as a Texinfo manual. If
the info and uniq programs are properly installed at your site, the
info coreutils 'uniq invocation'
should give you access to the complete manual.
GNU coreutils 8.22 November 2020 UNIQ(1)