usr/src/usr.bin/mesg/mesg.1

.\" Copyright (c) 1987 Regents of the University of California.
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms are permitted
.\" provided that this notice is preserved and that due credit is given
.\" to the University of California at Berkeley. The name of the University
.\" may not be used to endorse or promote products derived from this
.\" software without specific written prior permission. This software
.\" is provided ``as is'' without express or implied warranty.
.\"
.\"     @(#)mesg.1      6.2 (Berkeley) %G%
.\"
.TH MESG 1 ""
.AT 3
.SH NAME
mesg \- permit or deny messages
.SH SYNOPSIS
.B mesg
[
.B n
] [
.B y
]
.SH DESCRIPTION
\fIMesg\fP with argument \fBn\fP forbids messages via \fIwrite\fP
and \fItalk\fP by revoking non-user write permission on the user's
terminal.  \fIMesg\fP with argument \fBy\fP reinstates permission.
\fIMesg\fP without arguments reports the current state without
changing it.
.SH FILES
/dev/tty*
.SH "SEE ALSO"
write(1), talk(1)
.SH DIAGNOSTICS
Exit status is 0 if messages are receivable, 1 if not, -1 on error.