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.\" @(#)uniq.1 8.1 (Berkeley) 6/6/93 36.\" 37.Dd June 6, 1993 38.Dt UNIQ 1 39.Os 40.Sh NAME 41.Nm uniq 42.Nd report or filter out repeated lines in a file 43.Sh SYNOPSIS 44.Nm uniq 45.Op Fl c | Fl d | Fl u 46.Op Fl f Ar fields 47.Op Fl s Ar chars 48.Oo 49.Ar input_file 50.Op Ar output_file 51.Oc 52.Sh DESCRIPTION 53The 54.Nm uniq 55utility reads the standard input comparing adjacent lines, and writes 56a copy of each unique input line to the standard output. 57The second and succeeding copies of identical adjacent input lines are 58not written. 59Repeated lines in the input will not be detected if they are not adjacent, 60so it may be necessary to sort the files first. 61.Pp 62The following options are available: 63.Bl -tag -width Ds 64.It Fl c 65Precede each output line with the count of the number of times the line 66occurred in the input, followed by a single space. 67.It Fl d 68Don't output lines that are not repeated in the input. 69.It Fl f Ar fields 70Ignore the first 71.Ar fields 72in each input line when doing comparisons. 73A field is a string of non-blank characters separated from adjacent fields 74by blanks. 75Field numbers are one based, i.e. the first field is field one. 76.It Fl s Ar chars 77Ignore the first 78.Ar chars 79characters in each input line when doing comparisons. 80If specified in conjunction with the 81.Fl f 82option, the first 83.Ar chars 84characters after the first 85.Ar fields 86fields will be ignored. 87Character numbers are one based, i.e. the first character is character one. 88.It Fl u 89Don't output lines that are repeated in the input. 90.\".It Fl Ns Ar n 91.\"(Deprecated; replaced by 92.\".Fl f ) . 93.\"Ignore the first n 94.\"fields on each input line when doing comparisons, 95.\"where n is a number. 96.\"A field is a string of non-blank 97.\"characters separated from adjacent fields 98.\"by blanks. 99.\".It Cm \&\(pl Ns Ar n 100.\"(Deprecated; replaced by 101.\".Fl s ) . 102.\"Ignore the first 103.\".Ar m 104.\"characters when doing comparisons, where 105.\".Ar m 106.\"is a 107.\"number. 108.El 109.Pp 110If additional arguments are specified on the command line, the first 111such argument is used as the name of an input file, the second is used 112as the name of an output file. 113.Pp 114The 115.Nm uniq 116utility exits 0 on success, and >0 if an error occurs. 117.Sh COMPATIBILITY 118The historic 119.Cm \&\(pl Ns Ar number 120and 121.Fl Ns Ar number 122options have been deprecated but are still supported in this implementation. 123.Sh SEE ALSO 124.Xr sort 1 125.Sh STANDARDS 126The 127.Nm uniq 128utility is expected to be 129.St -p1003.2 130compatible. 131