'\" te
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.TH uniq 1 "13 Mar 2008" "SunOS 5.11" "User Commands"
.SH NAME
uniq \- report or filter out repeated lines in a file
.SH SYNOPSIS
.SS "/usr/bin/uniq"
.LP
.nf
\fB/usr/bin/uniq\fR [\fB-c\fR | \fB-d\fR | \fB-u\fR] [\fB-f\fR \fIfields\fR] [\fB-s\fR \fIchar\fR] 
     [\fIinput_file\fR [\fIoutput_file\fR]]
.fi

.LP
.nf
\fB/usr/bin/uniq\fR [\fB-c\fR | \fB-d\fR | \fB-u\fR] [\fB-n\fR] [+ \fIm\fR] [\fIinput_file\fR [\fIoutput_file\fR]]
.fi

.SS "ksh93"
.LP
.nf
\fBuniq\fR [\fB-cdiu\fR] [\fB-D\fR[\fIdelimit\fR]] [\fB-f\fR \fIfields\fR] [\fB-s\fR \fIchars\fR] [\fB-w\fR \fIchars\fR] 
     [\fIinput_file\fR [\fIoutput_file\fR]]
.fi

.LP
.nf
\fBuniq\fR [\fB-cdiu\fR] [\fB-D\fR[\fIdelimit\fR]] [\fB-n\fR] [\fB+m\fR] [\fB-w\fR \fIchars\fR] [\fIinput_file\fR [\fIoutput_file\fR]]
.fi

.SH DESCRIPTION
.SS "/usr/bin/uniq"
.sp
.LP
The \fBuniq\fR utility reads an input file comparing adjacent lines and writes
one copy of each input line on the output. The second and succeeding copies of
repeated adjacent input lines are not written.
.sp
.LP
Repeated lines in the input are not detected if they are not adjacent.
.SS "ksh93"
.sp
.LP
The \fBuniq\fR built-in in \fBksh93\fR is associated with the \fB/bin\fR or
\fB/usr/bin path\fR. It is invoked when \fBuniq\fR is executed without a
pathname prefix and the pathname search finds a \fB/bin/uniq\fR or
\fB/usr/bin/uniq\fR executable.
.sp
.LP
\fBuniq\fR reads an input, comparing adjacent lines, and writing one copy of
each input line on the output. The second and succeeding copies of the repeated
adjacent lines are not written.
.sp
.LP
If \fIoutput_file\fR is not specified, \fBuniq\fR writes to standard output. If
\fIinput_file\fR is not specified, or if \fIinput_file\fR is \fB-\fR,
\fBuniq\fR reads from standard input, and the start of the file is defined as
the current offset.
.SH OPTIONS
.SS "/usr/bin/uniq"
.sp
.LP
The following options are supported by \fB/usr/bin/uniq\fR:
.sp
.ne 2
.mk
.na
\fB\fB-c\fR\fR
.ad
.RS 13n
.rt  
Precedes each output line with a count of the number of times the line occurred
in the input.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-d\fR\fR
.ad
.RS 13n
.rt  
Suppresses the writing of lines that are not repeated in the input.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-f\fR \fIfields\fR\fR
.ad
.RS 13n
.rt  
Ignores the first \fIfields\fR fields on each input line when doing
comparisons, where \fIfields\fR is a positive decimal integer. A field is the
maximal string matched by the basic regular expression:
.sp
.in +2
.nf
[[:blank:]]*[^[:blank:]]*
.fi
.in -2
.sp

If \fIfields\fR specifies more fields than appear on an input line, a null
string is used for comparison.
.RE

.sp
.ne 2
.mk
.na
\fB\fB+\fR\fIm\fR\fR
.ad
.RS 13n
.rt  
Equivalent to \fB-s\fR \fIchars\fR with \fIchars\fR set to \fIm\fR.
.RE

.sp
.ne 2
.mk
.na
\fB\fB\(mi\fR\fIn\fR\fR
.ad
.RS 13n
.rt  
Equivalent to \fB-f\fR \fIfields\fR with \fIfields\fR set to \fIn\fR.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-s\fR \fIchars\fR\fR
.ad
.RS 13n
.rt  
Ignores the first \fIchars\fR characters when doing comparisons, where
\fIchars\fR is a positive decimal integer. If specified in conjunction with the
\fB-f\fR option, the first \fIchars\fR characters after the first \fIfields\fR
fields is ignored. If \fIchars\fR specifies more characters than remain on an
input line, a null string is used for comparison.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-u\fR\fR
.ad
.RS 13n
.rt  
Suppresses the writing of lines that are repeated in the input.
.RE

.SS "ksh93"
.sp
.LP
The following options are supported by the \fBuniq\fR built-in command is
\fBksh93\fR:
.sp
.ne 2
.mk
.na
\fB\fB-c\fR\fR
.ad
.br
.na
\fB\fB--count\fR\fR
.ad
.RS 28n
.rt  
Outputs the number of times each line occurred along with the line.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-d\fR\fR
.ad
.br
.na
\fB\fB--repeated | duplicates\fR\fR
.ad
.RS 28n
.rt  
Outputs only duplicate lines.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-D\fR\fR
.ad
.br
.na
\fB\fB--all-repeated\fR[\fB=\fR\fIdelimit\fR]\fR
.ad
.RS 28n
.rt  
Outputs all duplicate lines as a group with an empty line delimiter specified
by \fIdelimit\fR.
.sp
Specify \fIdelimit\fR as one of the following:
.sp
.ne 2
.mk
.na
\fB\fBnone\fR\fR
.ad
.RS 12n
.rt  
Do not delimit duplicate groups.
.RE

.sp
.ne 2
.mk
.na
\fB\fBprepend\fR\fR
.ad
.RS 12n
.rt  
Prepend an empty line before each group.
.RE

.sp
.ne 2
.mk
.na
\fB\fBseparate\fR\fR
.ad
.RS 12n
.rt  
Separate each group with an empty line.
.RE

The value for \fIdelimit\fR can be omitted. The default value is \fBnone\fR.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-f\fR\fR
.ad
.br
.na
\fB\fB--skip-fields=\fR\fIfields\fR\fR
.ad
.RS 28n
.rt  
Skips over \fIfields\fR number of fields before checking for uniqueness. A
field is the minimal string matching the \fBBRE
[[:\fR\fIblank\fR\fB:]]*[^[:\fR\fIblank\fR\fB:]]*\fR.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-i\fR\fR
.ad
.br
.na
\fB\fB--ignore-case\fR\fR
.ad
.RS 28n
.rt  
Ignore case in comparisons.
.RE

.sp
.ne 2
.mk
.na
\fB\fB+\fR\fIm\fR\fR
.ad
.RS 28n
.rt  
Equivalent to the \fB-s\fR \fIchars\fR option, with \fIchars\fR set to \fIm\fR.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-\fR\fIn\fR\fR
.ad
.RS 28n
.rt  
Equivalent to the \fB-f\fR \fIfields\fR option, with \fIfields\fR set to
\fIn\fR.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-s\fR\fR
.ad
.br
.na
\fB\fB--skip-chars=\fR\fIchars\fR\fR
.ad
.RS 28n
.rt  
Skips over \fIchars\fR number of characters before checking for uniqueness.
.sp
If specified with the \fB-f\fR option, the first \fIchars\fR after the first
fields are ignored. If the \fIchars\fR specifies more characters than are on
the line, an empty string is used for comparison.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-u\fR\fR
.ad
.br
.na
\fB\fB--uniq\fR\fR
.ad
.RS 28n
.rt  
Outputs unique lines.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-w\fR\fR
.ad
.br
.na
\fB\fB--check-chars=\fR\fIchars\fR\fR
.ad
.RS 28n
.rt  
Skips over any specified fields and characters, then compares \fIchars\fR
number of characters.
.RE

.SH OPERANDS
.sp
.LP
The following operands are supported:
.sp
.ne 2
.mk
.na
\fB\fIinput_file\fR\fR
.ad
.RS 15n
.rt  
A path name of the input file. If \fIinput_file\fR is not specified, or if the
\fIinput_file\fR is \fB\(mi\fR, the standard input is used.
.RE

.sp
.ne 2
.mk
.na
\fB\fIoutput_file\fR\fR
.ad
.RS 15n
.rt  
A path name of the output file. If \fIoutput_file\fR is not specified, the
standard output is used. The results are unspecified if the file named by
\fIoutput_file\fR is the file named by \fIinput_file\fR.
.RE

.SH EXAMPLES
.LP
\fBExample 1 \fRUsing the \fBuniq\fR Command
.sp
.LP
The following example lists the contents of the \fBuniq.test\fR file and
outputs a copy of the repeated lines.

.sp
.in +2
.nf
example% \fBcat uniq.test\fR
This is a test.
This is a test.
TEST.
Computer.
TEST.
TEST.
Software.

example% \fBuniq -d uniq.test\fR
This is a test.
TEST.
example%
.fi
.in -2
.sp

.sp
.LP
The next example outputs just those lines that are not repeated in the
\fBuniq.test\fR file.

.sp
.in +2
.nf
example% \fBuniq -u uniq.test\fR
TEST.
Computer.
Software.
example%
.fi
.in -2
.sp

.sp
.LP
The last example outputs a report with each line preceded by a count of the
number of times each line occurred in the file:

.sp
.in +2
.nf
example% \fBuniq -c uniq.test\fR
   2 This is a test.
   1 TEST.
   1 Computer.
   2 TEST.
   1 Software.
example%
.fi
.in -2
.sp

.SH ENVIRONMENT VARIABLES
.sp
.LP
See \fBenviron\fR(5) for descriptions of the following environment variables
that affect the execution of \fBuniq\fR: \fBLANG\fR, \fBLC_ALL\fR,
\fBLC_CTYPE\fR, \fBLC_MESSAGES\fR, and \fBNLSPATH\fR.
.SH EXIT STATUS
.sp
.LP
The following exit values are returned:
.sp
.ne 2
.mk
.na
\fB\fB0\fR\fR
.ad
.RS 6n
.rt  
Successful completion.
.RE

.sp
.ne 2
.mk
.na
\fB\fB>0\fR\fR
.ad
.RS 6n
.rt  
An error occurred.
.RE

.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.SS "/usr/bin/uniq"
.sp

.sp
.TS
tab() box;
cw(2.75i) |cw(2.75i) 
lw(2.75i) |lw(2.75i) 
.
ATTRIBUTE TYPEATTRIBUTE VALUE
_
CSIEnabled
_
Interface StabilityCommitted
_
StandardSee \fBstandards\fR(5).
.TE

.SS "ksh93"
.sp

.sp
.TS
tab() box;
cw(2.75i) |cw(2.75i) 
lw(2.75i) |lw(2.75i) 
.
ATTRIBUTE TYPEATTRIBUTE VALUE
_
Interface StabilitySee below.
.TE

.sp
.LP
The \fBksh93\fR built-in binding to \fB/bin\fR and \fB/usr/bin\fR is Volatile.
The built-in interfaces are Uncommitted.
.SH SEE ALSO
.sp
.LP
\fBcomm\fR(1), \fBksh93\fR(1), , \fBpcat\fR(1), \fBsort\fR(1),
\fBuncompress\fR(1), \fBattributes\fR(5), \fBenviron\fR(5), \fBstandards\fR(5)