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Name

Synopsis

Availability

SUNWcsu

Description

Broadcast Message from ...

If filename is given, then the message is read in from that file. Normally, pseudo-terminals that do not correspond to rlogin sessions are ignored. Thus, when using a window system, the message appears only on the console window. However, -a will send the message even to such pseudo-terminals.

It is used to warn all users, typically prior to shutting down the system.

The sender must be super-user to override any protections the users may have invoked (see mesg(1) ).

wall runs setgid() (see setuid(2) ) to the group ID tty, in order to have write permissions on other user’s terminals.

wall will detect non-printable characters before sending them to the user’s terminal. Control characters will appear as a " ^ " followed by the appropriate ASCII character; characters with the high-order bit set will appear in ‘meta’ notation. For example, ‘\003’ is displayed as ‘^C’ and ‘\372’ as ‘M-z’.

Options

-a

broadcast message to the console and pseudo-terminals.

-g grpname

broadcast to a specified group only.

Environment

If the LC_* variables ( LC_CTYPE, LC_TIME, LC_COLLATE, LC_NUMERIC, and LC_MONETARY ) (see environ(5) ) are not set in the environment, the operational behavior of wall for each corresponding locale category is determined by the value of the LANG environment variable. If LC_ALL is set, its contents are used to override both the LANG and the other LC_* variables. If none of the above variables are set in the environment, the "C" (U.S. style) locale determines how wall behaves.

Files

/dev/tty*

See Also

Notes

Table of Contents

• Name
• Synopsis
• Availability
• Description
• Options
• Environment
• Files
• See Also
• Notes