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.\" Copyright (c) 1987 Regents of the University of California.
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms are permitted
.\" provided that the above copyright notice and this paragraph are
.\" duplicated in all such forms and that any documentation,
.\" advertising materials, and other materials related to such
.\" distribution and use acknowledge that the software was developed
.\" by the University of California, Berkeley.  The name of the
.\" University may not be used to endorse or promote products derived
.\" from this software without specific prior written permission.
.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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.\"
.\"	@(#)mesg.1	6.3 (Berkeley) 7/9/88
.\"
.TH MESG 1 "July 9, 1988"
.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.

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