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- .\" Copyright (c) 1991 Regents of the University of California.
- .\" All rights reserved.
- .\"
- .\" This code is derived from software contributed to Berkeley by
- .\" the Institute of Electrical and Electronics Engineers, Inc.
- .\"
- .\" Redistribution and use in source and binary forms, with or without
- .\" modification, are permitted provided that the following conditions
- .\" are met:
- .\" 1. Redistributions of source code must retain the above copyright
- .\" notice, this list of conditions and the following disclaimer.
- .\" 2. Redistributions in binary form must reproduce the above copyright
- .\" notice, this list of conditions and the following disclaimer in the
- .\" documentation and/or other materials provided with the distribution.
- .\" 3. All advertising materials mentioning features or use of this software
- .\" must display the following acknowledgement:
- .\" This product includes software developed by the University of
- .\" California, Berkeley and its contributors.
- .\" 4. Neither the name of the University nor the names of its contributors
- .\" may be used to endorse or promote products derived from this software
- .\" without specific prior written permission.
- .\"
- .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- .\" SUCH DAMAGE.
- .\"
- .\" @(#)uniq.1 6.5 (Berkeley) 1/9/92
- .\"
- .Dd January 9, 1992
- .Dt UNIQ
- .Os
- .Sh NAME
- .Nm uniq
- .Nd report or filter out repeated lines in a file
- .Sh SYNOPSIS
- .Nm uniq
- .Op Fl c | Fl d | Fl u
- .Op Fl f Ar fields
- .Op Fl s Ar chars
- .Oo
- .Ar input_file
- .Op Ar output_file
- .Oc
- .Sh DESCRIPTION
- The
- .Nm uniq
- utility reads the standard input comparing adjacent lines, and writes
- a copy of each unique input line to the standard output.
- The second and succeeding copies of identical adjacent input lines are
- not written.
- Repeated lines in the input will not be detected if they are not adjacent,
- so it may be necessary to sort the files first.
- .Pp
- The following options are available:
- .Bl -tag -width Ds
- .It Fl c
- Precede each output line with the count of the number of times the line
- occurred in the input, followed by a single space.
- .It Fl d
- Don't output lines that are not repeated in the input.
- .It Fl f Ar fields
- Ignore the first
- .Ar fields
- in each input line when doing comparisons.
- A field is a string of non-blank characters separated from adjacent fields
- by blanks.
- Field numbers are one based, i.e. the first field is field one.
- .It Fl s Ar chars
- Ignore the first
- .Ar chars
- characters in each input line when doing comparisons.
- If specified in conjunction with the
- .Fl f
- option, the first
- .Ar chars
- characters after the first
- .Ar fields
- fields will be ignored.
- Character numbers are one based, i.e. the first character is character one.
- .It Fl u
- Don't output lines that are repeated in the input.
- .\".It Fl Ns Ar n
- .\"(Deprecated; replaced by
- .\".Fl f ) .
- .\"Ignore the first n
- .\"fields on each input line when doing comparisons,
- .\"where n is a number.
- .\"A field is a string of non-blank
- .\"characters separated from adjacent fields
- .\"by blanks.
- .\".It Cm \&\(pl Ns Ar n
- .\"(Deprecated; replaced by
- .\".Fl s ) .
- .\"Ignore the first
- .\".Ar m
- .\"characters when doing comparisons, where
- .\".Ar m
- .\"is a
- .\"number.
- .El
- .Pp
- If additional arguments are specified on the command line, the first
- such argument is used as the name of an input file, the second is used
- as the name of an output file.
- .Pp
- The
- .Nm uniq
- utility exits 0 on success, and >0 if an error occurs.
- .Sh COMPATIBILITY
- The historic
- .Cm \&\(pl Ns Ar number
- and
- .Fl Ns Ar number
- options have been deprecated but are still supported in this implementation.
- .Sh SEE ALSO
- .Xr sort 1
- .Sh STANDARDS
- The
- .Nm uniq
- utility is expected to be
- .St -p1003.2
- compatible.
-