+.\" 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 6.4 (Berkeley) 6/27/91
+.\"
+.Dd June 27, 1991
+.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
+.Pp
+Deprecated Version:
+.Pp
+.Nm uniq
+.Op Fl cdu
+.Op Fl Ns Ar n
+.Op Cm \(pl Ns Ar n
+.Oo
+.Ar input_file
+.Op Ar output_file
+.Oc
+.Sh DESCRIPTION
+The
+.Nm uniq
+utility reads an input file or the standard input
+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.
+Repeated lines in the input are not detected if they are
+not adjacent, so it is important to
+.Xr sort 1
+the files first.
+.Pp
+The following options are available:
+.Bl -tag -width Ds
+.It Fl c
+Precede each output line with a count of the number
+of times the line occurred in the input. For example:
+.Bd -literal -offset indent
+duplicate_count line_number
+.Ed
+.Pp
+where the duplicate count is a blank padded field of
+up to four digits followed by a space.
+.It Fl d
+Suppress the writing of lines that are not repeated
+in the input.
+.It Fl f Ar fields
+Ignore the first fields on each input line when
+doing comparisons, where fields is a positive
+decimal integer.
+A field is a string of non-blank
+characters separated from adjacent fields
+by blanks.
+.It Fl s Ar chars
+Ignore the first chars characters when doing
+comparisons, where chars is a positive decimal
+integer.
+If specified in conjunction with the
+.Fl f
+option, the first chars characters after the first
+fields fields will be ignored.
+.It Fl u
+Suppress the writing of 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
+The following operands are available:
+.Bl -tag -width output_filex
+.It Ar input_file
+A pathname of the input file.
+If the
+.Ar input_file
+operand is not specified, the standard input is
+used.
+.It Ar output_file
+A pathname of the output file.
+This name shall
+always be different from
+.Ar input_file.
projects / unix-history / blobdiff