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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "MESG" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" mesg 
+.SH NAME
+mesg \- permit or deny messages
+.SH SYNOPSIS
+.LP
+\fBmesg\fP \fB[\fP\fBy|n\fP\fB]\fP\fB\fP
+.SH DESCRIPTION
+.LP
+The \fImesg\fP utility shall control whether other users are allowed
+to send messages via \fIwrite\fP, \fItalk\fP, or other utilities to
+a terminal
+device. The terminal device affected shall be determined by searching
+for the first terminal in the sequence of devices associated
+with standard input, standard output, and standard error, respectively.
+With no arguments, \fImesg\fP shall report the current
+state without changing it. Processes with appropriate privileges may
+be able to send messages to the terminal independent of the
+current state.
+.SH OPTIONS
+.LP
+None.
+.SH OPERANDS
+.LP
+The following operands shall be supported in the POSIX locale:
+.TP 7
+\fIy\fP
+Grant permission to other users to send messages to the terminal device.
+.TP 7
+\fIn\fP
+Deny permission to other users to send messages to the terminal device.
+.sp
+.SH STDIN
+.LP
+Not used.
+.SH INPUT FILES
+.LP
+None.
+.SH ENVIRONMENT VARIABLES
+.LP
+The following environment variables shall affect the execution of
+\fImesg\fP:
+.TP 7
+\fILANG\fP
+Provide a default value for the internationalization variables that
+are unset or null. (See the Base Definitions volume of
+IEEE\ Std\ 1003.1-2001, Section 8.2, Internationalization Variables
+for
+the precedence of internationalization variables used to determine
+the values of locale categories.)
+.TP 7
+\fILC_ALL\fP
+If set to a non-empty string value, override the values of all the
+other internationalization variables.
+.TP 7
+\fILC_CTYPE\fP
+Determine the locale for the interpretation of sequences of bytes
+of text data as characters (for example, single-byte as
+opposed to multi-byte characters in arguments).
+.TP 7
+\fILC_MESSAGES\fP
+Determine the locale that should be used to affect the format and
+contents of diagnostic messages written (by \fImesg\fP) to
+standard error.
+.TP 7
+\fINLSPATH\fP
+Determine the location of message catalogs for the processing of \fILC_MESSAGES
+\&.\fP 
+.sp
+.SH ASYNCHRONOUS EVENTS
+.LP
+Default.
+.SH STDOUT
+.LP
+If no operand is specified, \fImesg\fP shall display the current terminal
+state in an unspecified format.
+.SH STDERR
+.LP
+The standard error shall be used only for diagnostic messages.
+.SH OUTPUT FILES
+.LP
+None.
+.SH EXTENDED DESCRIPTION
+.LP
+None.
+.SH EXIT STATUS
+.LP
+The following exit values shall be returned:
+.TP 7
+\ 0
+Receiving messages is allowed.
+.TP 7
+\ 1
+Receiving messages is not allowed.
+.TP 7
+>1
+An error occurred.
+.sp
+.SH CONSEQUENCES OF ERRORS
+.LP
+Default.
+.LP
+\fIThe following sections are informative.\fP
+.SH APPLICATION USAGE
+.LP
+The mechanism by which the message status of the terminal is changed
+is unspecified. Therefore, unspecified actions may cause
+the status of the terminal to change after \fImesg\fP has successfully
+completed. These actions may include, but are not limited
+to: another invocation of the \fImesg\fP utility, login procedures;
+invocation of the \fIstty\fP utility, invocation of the \fIchmod\fP
+utility or
+\fIchmod\fP() function, and so on.
+.SH EXAMPLES
+.LP
+None.
+.SH RATIONALE
+.LP
+The terminal changed by \fImesg\fP is that associated with the standard
+input, output, or error, rather than the controlling
+terminal for the session. This is because users logged in more than
+once should be able to change any of their login terminals
+without having to stop the job running in those sessions. This is
+not a security problem involving the terminals of other users
+because appropriate privileges would be required to affect the terminal
+of another user.
+.LP
+The method of checking each of the first three file descriptors in
+sequence until a terminal is found was adopted from System
+V.
+.LP
+The file \fB/dev/tty\fP is not specified for the terminal device because
+it was thought to be too restrictive. Typical
+environment changes for the \fIn\fP operand are that write permissions
+are removed for \fIothers\fP and \fIgroup\fP from the
+appropriate device. It was decided to leave the actual description
+of what is done as unspecified because of potential differences
+between implementations.
+.LP
+The format for standard output is unspecified because of differences
+between historical implementations. This output is
+generally not useful to shell scripts (they can use the exit status),
+so exact parsing of the output is unnecessary.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fItalk\fP , \fIwrite\fP()
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group. In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .