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.TH UNIQ 1 "2026-05-31"
.SH NAME
uniq \- Report or omit repeated lines.
.SH SYNOPSIS
\fBuniq\fR [\fB\-D\fR|\fB\-\-all\-repeated\fR] [\fB\-\-group\fR] [\fB\-w\fR|\fB\-\-check\-chars\fR] [\fB\-c\fR|\fB\-\-count\fR] [\fB\-i\fR|\fB\-\-ignore\-case\fR] [\fB\-d\fR|\fB\-\-repeated\fR] [\fB\-s\fR|\fB\-\-skip\-chars\fR] [\fB\-f\fR|\fB\-\-skip\-fields\fR] [\fB\-u\fR|\fB\-\-unique\fR] [\fB\-z\fR|\fB\-\-zero\-terminated\fR] [\fB\-h\fR|\fB\-\-help\fR] [\fB\-V\fR|\fB\-\-version\fR] [\fIfiles\fR]
.SH DESCRIPTION
Report or omit repeated lines.
.SH OPTIONS
.TP
\fB\-D\fR, \fB\-\-all\-repeated\fR[=\fI<delimit\-method>\fR]
print all duplicate lines. Delimiting is done with blank lines. [default: none]

\fIPossible values:\fR
.RS 14
.IP \(bu 2
none
.IP \(bu 2
prepend
.IP \(bu 2
separate
.RE
.TP
\fB\-\-group\fR[=\fI<group\-method>\fR]
show all items, separating groups with an empty line. [default: separate]

\fIPossible values:\fR
.RS 14
.IP \(bu 2
separate
.IP \(bu 2
prepend
.IP \(bu 2
append
.IP \(bu 2
both
.RE
.TP
\fB\-w\fR, \fB\-\-check\-chars\fR \fI<N>\fR
compare no more than N characters in lines
.TP
\fB\-c\fR, \fB\-\-count\fR
prefix lines by the number of occurrences
.TP
\fB\-i\fR, \fB\-\-ignore\-case\fR
ignore differences in case when comparing
.TP
\fB\-d\fR, \fB\-\-repeated\fR
only print duplicate lines
.TP
\fB\-s\fR, \fB\-\-skip\-chars\fR \fI<N>\fR
avoid comparing the first N characters
.TP
\fB\-f\fR, \fB\-\-skip\-fields\fR \fI<N>\fR
avoid comparing the first N fields
.TP
\fB\-u\fR, \fB\-\-unique\fR
only print unique lines
.TP
\fB\-z\fR, \fB\-\-zero\-terminated\fR
end lines with 0 byte, not newline
.TP
\fB\-h\fR, \fB\-\-help\fR
Print help
.TP
\fB\-V\fR, \fB\-\-version\fR
Print version
.SH EXTRA
Filter adjacent matching lines from INPUT (or standard input),
writing to OUTPUT (or standard output).

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.
.SH VERSION
v(uutils coreutils) 0.9.0