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mesg(1) [sunos man page]

mesg(1) 							   User Commands							   mesg(1)

NAME
mesg - permit or deny messages SYNOPSIS
mesg [-n | -y | n | y] DESCRIPTION
The mesg utility will control whether other users are allowed to send messages via write(1), talk(1), or other utilities to a terminal device. The terminal device affected is 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, mesg reports the current state without changing it. Processes with appropriate privileges may be able to send messages to the terminal independent of the current state. OPTIONS
The following options are supported: -n|n Denies permission to other users to send message to the terminal. See write(1). -y|y Grants permission to other users to send messages to the terminal. ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of mesg: LANG, LC_ALL, LC_CTYPE, LC_MES- SAGES, and NLSPATH. EXIT STATUS
The following exit values are returned: 0 if messages are receivable. 1 if messages are not receivable. 2 on error. FILES
/dev/tty* terminal devices /dev/pts/* terminal devices ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ SEE ALSO
talk(1), write(1), attributes(5), environ(5), standards(5) SunOS 5.10 31 Oct 1997 mesg(1)

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mesg(1) 						      General Commands Manual							   mesg(1)

NAME
mesg - Permits or refuses write messages SYNOPSIS
mesg [y | n ] [Tru64 UNIX] The following format is supported for backward compatibility: mesg [[-]y[es] | [-]n[o] ] STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: mesg: XCU5.0 Refer to the standards(5) reference page for more information about industry standards and associated tags. OPERANDS
Grants permission to other users to send messages to the terminal device. [Tru64 UNIX] You can optionally include a - (hyphen) before y, include es after y, or both. Denies permission to other users to send messages to the terminal device. [Tru64 UNIX] You can optionally include a - (hyphen) before n, include o after n, or both. DESCRIPTION
The mesg command controls whether other users on the system can send messages to you with the talk and write commands. Called without arguments, mesg displays the current terminal message permission setting. [Tru64 UNIX] The shell start-up procedure disallows messages by default. You can override this default action by including the line mesg y in your $HOME/.profile (sh), (csh), or (csh) file. Note [Tru64 UNIX] This default setting described for the shell start-up procedure message permissions assumes that the shell is one started as part of a login session. If the shell got started by some other means, the default depends on what that other program has done. [Tru64 UNIX] Any user can send messages with write if the receiving user has enabled messages. A user with the sysadmin command autho- rization can send messages to any terminal. The terminal device affected is determined by searching for the first terminal in the sequence of devices associated with standard input, standard output, and standard error, respectively. (In other words, the affected device is not the same as the controlling terminal for the session.) [Tru64 UNIX] Message permission has no effect on messages delivered through the electronic mail system. [Tru64 UNIX] If you add mesg y to your $HOME/.profile, you will be able to receive messages from other users via the write command or the talk command. If you add mesg n to your $HOME/.profile, you will not be able to receive messages from other users via the write command or the talk command. The mesg command also accepts the current locale's equivalent of yes and no. These equivalents are determined by the setting of the LC_MESSAGES environment variable. The usage message displays the current locale's equivalent of yes and no. Security Restrictions [Tru64 UNIX] In the trusted configuration of the system, all terminal devices have owner set to the login user and group set to the pseu- dogroup tty. The login command sets terminal modes to 0600 at login time, so you must explicitly use mesg y to enable access from unautho- rized users. NOTES
[Tru64 UNIX] If your current locale defines settings other than yes or no, the mesg command does not accept yes or no as arguments. This causes an error if you use a yes or no argument to mesg in your file. EXIT STATUS
The following exit values are returned: Message reception is allowed. Message reception is denied. An error occurred. EXAMPLES
To allow only appropriately authorized users to send messages to your terminal, enter: mesg no To allow everyone the permission to send messages to your terminal, enter: mesg yes To determine the state of message acceptance of your terminal, enter: mesg This will give one of the following responses, as appropriate: is yes is no ENVIRONMENT VARIABLES
The following environment variables affect the execution of mesg: Provides a default value for the internationalization variables that are unset or null. If LANG is unset or null, the corresponding value from the default locale is used. If any of the internationalization vari- ables contain an invalid setting, the utility behaves as if none of the variables had been defined. If set to a non-empty string value, overrides the values of all the other internationalization variables. Determines the locale for the interpretation of sequences of bytes of text data as characters (for example, single-byte as opposed to multibyte characters in arguments). Determines the locale for the for- mat and contents of diagnostic messages written to standard error. Determines the location of message catalogues for the processing of LC_MESSAGES. FILES
User profile User profile (csh) User profile (csh) Your current terminal SEE ALSO
Commands: chmod(1), csh(1), Bourne shell sh(1b), POSIX shell sh(1p), stty(1), talk(1), wall(1), write(1) Functions: chmod(2) Standards: standards(5) mesg(1)
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