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 too.
−c, −−countprefix lines by the number of occurrences
−d, −−repeatedonly 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=Navoid comparing the first N fields
−i, −−ignore−caseignore differences in case when comparing
−s, −−skip−chars=Navoid comparing the first N characters
−u, −−uniqueonly print unique lines
−z, −−zero−terminatedend lines with 0 byte, not newline
−w, −−check−chars=Ncompare no more than N characters in lines
−−helpdisplay this help and exit
−−versionoutput 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.
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Note |
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'uniq' does not detect repeated lines unless they
are adjacent. You may want to sort the input first,
or use 'sort |
Report uniq bugs to bug−coreutils@gnu.org
GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
General help using GNU software: <http://www.gnu.org/gethelp/>
Report uniq translation bugs to <http://translationproject.org/team/>
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.
| COPYRIGHT |
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Copyright © 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. |