UNIQ - Online Linux Manual PageSection : 1
Updated : January 2023
Source : GNU coreutils 9.1
Note : User Commands
NAMEuniq − report or omit repeated lines
SYNOPSISuniq [OPTION]... [INPUT [OUTPUT]]
DESCRIPTION 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, −−count prefix lines by the number of occurrences −d, −−repeated only print duplicate lines, one for each group −D print all duplicate lines −−all−repeated[=METHOD] like −D, but allow separating groups with an empty line; METHOD={none(default),prepend,separate} −f, −−skip−fields=N avoid comparing the first N fields −−group[=METHOD] show all items, separating groups with an empty line; METHOD={separate(default),prepend,append,both} −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 line delimiter is NUL, 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'.
AUTHORWritten by Richard M. Stallman and David MacKenzie.
REPORTING BUGSGNU coreutils online help: <https://www.gnu.org/software/coreutils/>
Report any translation bugs to <https://translationproject.org/team/>
COPYRIGHTCopyright © 2022 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <https://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.
SEE ALSOcomm(1), join(1), sort(1)
Full documentation <https://www.gnu.org/software/coreutils/uniq>
or available locally via: info '(coreutils) uniq invocation' 0
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