1.\" Copyright (c) 1991 Regents of the University of California. 2.\" 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.\" %sccs.include.redist.roff% 8.\" 9.\" @(#)uniq.1 6.4 (Berkeley) 06/27/91 10.\" 11.Dd 12.Dt UNIQ 1 13.Os 14.Sh NAME 15.Nm uniq 16.Nd Report or filter out repeated lines in a file. 17.Sh SYNOPSIS 18.Nm uniq 19.Op Fl c | Fl d | Fl u 20.Op Fl f Ar fields 21.Op Fl s Ar chars 22.Oo 23.Ar input_file 24.Op Ar output_file 25.Oc 26.Pp 27Deprecated Version: 28.Pp 29.Nm uniq 30.Op Fl cdu 31.Op Fl Ns Ar n 32.Op Cm \(pl Ns Ar n 33.Oo 34.Ar input_file 35.Op Ar output_file 36.Oc 37.Sh DESCRIPTION 38The 39.Nm uniq 40utility reads an input file or the standard input 41comparing adjacent 42lines, and writes one copy of each input line on the output. 43The second and succeeding copies of repeated adjacent input 44lines are not written. 45Repeated lines in the input are not detected if they are 46not adjacent, so it is important to 47.Xr sort 1 48the files first. 49.Pp 50The following options are available: 51.Bl -tag -width Ds 52.It Fl c 53Precede each output line with a count of the number 54of times the line occurred in the input. For example: 55.Bd -literal -offset indent 56duplicate_count line_number 57.Ed 58.Pp 59where the duplicate count is a blank padded field of 60up to four digits followed by a space. 61.It Fl d 62Suppress the writing of lines that are not repeated 63in the input. 64.It Fl f Ar fields 65Ignore the first fields on each input line when 66doing comparisons, where fields is a positive 67decimal integer. 68A field is a string of non-blank 69characters separated from adjacent fields 70by blanks. 71.It Fl s Ar chars 72Ignore the first chars characters when doing 73comparisons, where chars is a positive decimal 74integer. 75If specified in conjunction with the 76.Fl f 77option, the first chars characters after the first 78fields fields will be ignored. 79.It Fl u 80Suppress the writing of lines that are repeated in 81the input. 82.It Fl Ns Ar n 83(Deprecated; replaced by 84.Fl f ) . 85Ignore the first n 86fields on each input line when doing comparisons, 87where n is a number. 88A field is a string of non-blank 89characters separated from adjacent fields 90by blanks. 91.It Cm \&\(pl Ns Ar n 92(Deprecated; replaced by 93.Fl s ) . 94Ignore the first 95.Ar m 96characters when doing comparisons, where 97.Ar m 98is a 99number. 100.El 101.Pp 102The following operands are available: 103.Bl -tag -width output_filex 104.It Ar input_file 105A pathname of the input file. 106If the 107.Ar input_file 108operand is not specified, the standard input is 109used. 110.It Ar output_file 111A pathname of the output file. 112This name shall 113always be different from 114.Ar input_file. 115If the 116.Ar output_file 117operand is not specified, the standard 118output is used. If 119.Ar output_file 120is created and an error occurs or a sugnal is caught the 121.Ar output_file 122is not removed. 123.El 124.\" .Pp 125.\" The following environment variables affect the execution of 126.\" uniq: 127.\" .Tl Em LC_CTYPE 128.\" The locale for character classification, used to 129.\" determine the characters constituting a blank in 130.\" the current locale. 131.Pp 132The 133.Xr uniq 134utility exits 0 on success, and >0 if an error occurs. 135.Sh STANDARDS 136The 137.Xr uniq 138utility is expected to be 139.St -p1003.2 140compatible. 141