1.\" Copyright (c) 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" the Institute of Electrical and Electronics Engineers, Inc. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 3. All advertising materials mentioning features or use of this software 16.\" must display the following acknowledgement: 17.\" This product includes software developed by the University of 18.\" California, Berkeley and its contributors. 19.\" 4. Neither the name of the University nor the names of its contributors 20.\" may be used to endorse or promote products derived from this software 21.\" without specific prior written permission. 22.\" 23.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33.\" SUCH DAMAGE. 34.\" 35.\" From: @(#)uniq.1 8.1 (Berkeley) 6/6/93 36.\" $FreeBSD$ 37.\" 38.Dd June 6, 1993 39.Dt UNIQ 1 40.Os 41.Sh NAME 42.Nm uniq 43.Nd report or filter out repeated lines in a file 44.Sh SYNOPSIS 45.Nm 46.Op Fl c | Fl d | Fl u 47.Op Fl i 48.Op Fl f Ar fields 49.Op Fl s Ar chars 50.Oo 51.Ar input_file 52.Op Ar output_file 53.Oc 54.Sh DESCRIPTION 55The 56.Nm 57utility reads the standard input comparing adjacent lines, and writes 58a copy of each unique input line to the standard output. 59The second and succeeding copies of identical adjacent input lines are 60not written. 61Repeated lines in the input will not be detected if they are not adjacent, 62so it may be necessary to sort the files first. 63.Pp 64The following options are available: 65.Bl -tag -width Ds 66.It Fl c 67Precede each output line with the count of the number of times the line 68occurred in the input, followed by a single space. 69.It Fl d 70Only output lines that are repeated in the input. 71.It Fl f Ar fields 72Ignore the first 73.Ar fields 74in each input line when doing comparisons. 75A field is a string of non-blank characters separated from adjacent fields 76by blanks. 77Field numbers are one based, i.e. the first field is field one. 78.It Fl s Ar chars 79Ignore the first 80.Ar chars 81characters in each input line when doing comparisons. 82If specified in conjunction with the 83.Fl f 84option, the first 85.Ar chars 86characters after the first 87.Ar fields 88fields will be ignored. 89Character numbers are one based, i.e. the first character is character one. 90.It Fl u 91Only output lines that are not repeated in the input. 92.It Fl i 93Case insensitive comparison of lines. 94.\".It Fl Ns Ar n 95.\"(Deprecated; replaced by 96.\".Fl f ) . 97.\"Ignore the first n 98.\"fields on each input line when doing comparisons, 99.\"where n is a number. 100.\"A field is a string of non-blank 101.\"characters separated from adjacent fields 102.\"by blanks. 103.\".It Cm \&\(pl Ns Ar n 104.\"(Deprecated; replaced by 105.\".Fl s ) . 106.\"Ignore the first 107.\".Ar m 108.\"characters when doing comparisons, where 109.\".Ar m 110.\"is a 111.\"number. 112.El 113.Pp 114If additional arguments are specified on the command line, the first 115argument is used as the name of an input file, the second is used 116as the name of an output file. 117.Sh DIAGNOSTICS 118.Ex -std 119.Sh COMPATIBILITY 120The historic 121.Cm \&\(pl Ns Ar number 122and 123.Fl Ns Ar number 124options have been deprecated but are still supported in this implementation. 125.Sh SEE ALSO 126.Xr sort 1 127.Sh STANDARDS 128The 129.Nm 130utility is expected to be 131.St -p1003.2 132compatible. 133