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+'\" et
+.TH MESG "1P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\"
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+.\"
+.SH NAME
+mesg
+\(em permit or deny messages
+.SH SYNOPSIS
+.LP
+.nf
+mesg \fB[\fRy|n\fB]\fR
+.fi
+.SH DESCRIPTION
+The
+.IR mesg
+utility shall control whether other users are allowed to send messages
+via
+.IR write ,
+.IR talk ,
+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,
+.IR mesg
+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
+None.
+.SH OPERANDS
+The following operands shall be supported in the POSIX locale:
+.IP "\fIy\fR" 10
+Grant permission to other users to send messages to the terminal
+device.
+.IP "\fIn\fR" 10
+Deny permission to other users to send messages to the terminal
+device.
+.SH STDIN
+Not used.
+.SH "INPUT FILES"
+None.
+.SH "ENVIRONMENT VARIABLES"
+The following environment variables shall affect the execution of
+.IR mesg :
+.IP "\fILANG\fP" 10
+Provide a default value for the internationalization variables that are
+unset or null. (See the Base Definitions volume of POSIX.1\(hy2017,
+.IR "Section 8.2" ", " "Internationalization Variables"
+for the precedence of internationalization variables used to determine
+the values of locale categories.)
+.IP "\fILC_ALL\fP" 10
+If set to a non-empty string value, override the values of all the
+other internationalization variables.
+.IP "\fILC_CTYPE\fP" 10
+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).
+.IP "\fILC_MESSAGES\fP" 10
+.br
+Determine the locale that should be used to affect the format and
+contents of diagnostic messages written (by
+.IR mesg )
+to standard error.
+.IP "\fINLSPATH\fP" 10
+Determine the location of message catalogs for the processing of
+.IR LC_MESSAGES .
+.SH "ASYNCHRONOUS EVENTS"
+Default.
+.SH STDOUT
+If no operand is specified,
+.IR mesg
+shall display the current terminal state in an unspecified format.
+.SH STDERR
+The standard error shall be used only for diagnostic messages.
+.SH "OUTPUT FILES"
+None.
+.SH "EXTENDED DESCRIPTION"
+None.
+.SH "EXIT STATUS"
+The following exit values shall be returned:
+.IP "\00" 6
+Receiving messages is allowed.
+.IP "\01" 6
+Receiving messages is not allowed.
+.IP >1 6
+An error occurred.
+.SH "CONSEQUENCES OF ERRORS"
+Default.
+.LP
+.IR "The following sections are informative."
+.SH "APPLICATION USAGE"
+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
+.IR mesg
+has successfully completed. These actions may include, but are not
+limited to: another invocation of the
+.IR mesg
+utility, login procedures; invocation of the
+.IR stty
+utility, invocation of the
+.IR chmod
+utility or
+\fIchmod\fR()
+function, and so on.
+.SH EXAMPLES
+None.
+.SH RATIONALE
+The terminal changed by
+.IR mesg
+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.
+.P
+The method of checking each of the first three file descriptors in
+sequence until a terminal is found was adopted from System V.
+.P
+The file
+.BR /dev/tty
+is not specified for the terminal device because it was thought to be
+too restrictive. Typical environment changes for the
+.IR n
+operand are that write permissions are removed for
+.IR others
+and
+.IR group
+from the appropriate device. It was decided to leave the actual
+description of what is done as unspecified because of potential
+differences between implementations.
+.P
+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"
+None.
+.SH "SEE ALSO"
+.IR "\fItalk\fR\^",
+.IR "\fIwrite\fR\^"
+.P
+The Base Definitions volume of POSIX.1\(hy2017,
+.IR "Chapter 8" ", " "Environment Variables"
+.\"
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1-2017, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 7, 2018 Edition,
+Copyright (C) 2018 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 .
+.PP
+Any typographical or formatting errors that appear
+in this page are most likely
+to have been introduced during the conversion of the source files to
+man page format. To report such errors, see
+https://www.kernel.org/doc/man-pages/reporting_bugs.html .