NetBSD/usr.bin/comm/comm.1

.\"	$NetBSD: comm.1,v 1.9 2002/02/08 01:36:21 ross Exp $
.\"
.\" Copyright (c) 1989, 1990, 1993
.\"	The 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.
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.\" modification, are permitted provided that the following conditions
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.\"    must display the following acknowledgement:
.\"	This product includes software developed by the University of
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.\" 4. Neither the name of the University nor the names of its contributors
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.\"     @(#)comm.1	8.1 (Berkeley) 6/6/93
.\"
.Dd June 6, 1993
.Os
.Dt COMM 1
.Sh NAME
.Nm comm
.Nd select or reject lines common to two files
.Sh SYNOPSIS
.Nm
.Op Fl 123f
.Ar file1 file2
.Sh DESCRIPTION
The
.Nm
utility reads
.Ar file1
and
.Ar file2 ,
which should be
sorted lexically, and produces three text
columns as output: lines only in
.Ar file1 ;
lines only in
.Ar file2 ;
and lines in both files.
.Pp
The filename ``-'' means the standard input.
.Pp
The following options are available:
.Bl -tag -width Ds
.It Fl 1
Suppress printing of column 1.
.It Fl 2
Suppress printing of column 2.
.It Fl 3
Suppress printing of column 3.
.It Fl f
Fold case in line comparisons.
.El
.Pp
Each column will have a number of tab characters prepended to it
equal to the number of lower numbered columns that are being printed.
For example, if column number two is being suppressed, lines printed
in column number one will not have any tabs preceding them, and lines
printed in column number three will have one.
.Pp
.Nm
assumes that the files are lexically sorted; all characters
participate in line comparisons.
.\" .Sh ENVIRONMENT
.\" .Bl -tag -width indent
.\" .It Ev LANG
.\" .It Ev LC_ALL
.\" .It Ev LC_CTYPE
.\" .It Ev LC_COLLATE
.\" .It Ev LC_MESSAGES
.\" .El
.Sh EXIT STATUS
.Nm
exits 0 on success, \*[Gt]0 if an error occurred.
.Sh SEE ALSO
.Xr cmp 1 ,
.Xr diff 1 ,
.Xr sort 1 ,
.Xr uniq 1
.Sh STANDARDS
The
.Nm
utility conforms to
.St -p1003.2-92 .