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
-D print all duplicate lines
like -D, but allow separating groups with an empty line;
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
line delimiter is NUL, 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'.
This page is part of the coreutils (basic file, shell and text
manipulation utilities) project. Information about the project can
be found at ⟨http://www.gnu.org/software/coreutils/⟩. If you have a
bug report for this manual page, see
⟨http://www.gnu.org/software/coreutils/⟩. This page was obtained from
the tarball coreutils-8.26.tar.xz fetched from
⟨http://www.gnutls.org/download.html⟩ on 2016-12-10. If you discover
any rendering problems in this HTML version of the page, or you
believe there is a better or more up-to-date source for the page, or
you have corrections or improvements to the information in this
COLOPHON (which is not part of the original manual page), send a mail
GNU coreutils 8.26 November 2016 UNIQ(1)