Wall command
From NetworkCommands
A command available on most Linux platforms; used to send instant messages to other console/terminal users connected to the system.
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Usage Syntax
wall [-n] [message]
The only option is;
- -n - Change the normal banner printed by wall to "Remote broadcast message". This option can only be used by root.
A single line message can be specified along with the command or by entering just the command name and pressing [RETURN], the message will then be read from standard input.
Usage Examples
wall - send a message to all other console/terminal users, read message from standard input
wall testing testing - send message testing testing to all other console/terminal users
wall testing\!\! testing\!\! - send message testing!! testing!! to all other console/terminal users
wall < test.txt - send a message to all other console/terminal users, read message from file: test.txt
Usage Notes
The standard banner printed is as follows;
Broadcast message from username (pts/3) (Tue Sep 2 16:59:21 2008):
To enter a multi-line message simply enter the wall command without any options or parameters, you can then enter up to 20 lines of text. Use [CTRL]+D to indicate the end of the message.
Message length is limited to 20 lines
Linux Usage Notes
With most Linux or Unix commands;
- Brief help can be displayed using the option/keyword: -h or --help, for example: chmod --help
- A full command manual can be displayed using the man command followed by the command name, for example: man chmod
- Sometimes 'info' pages are used instead of or to provide more information than man pages; for example: info chmod
- Version information can be display using the option/keyword: -v or --version, for example: chmod --version
Related Files
The wall executable is normally found here: /usr/bin/wall
Related Commands
The mesg command can be used to enable or disable write access to a console/terminal and thus enable or disable whether messages sent by wall are received at your console/terminal.
Command Equivalents
The Cisco command equivalent is the send command 
Related Articles
Information on other Linux commands 
Information on F5 BigIP commands 
Information on Cisco commands
Information on Vyatta commands 
Information on Extreme commands 
Information on Zebra commands
Information on Secure Platform commands
Information on Blue Coat SGOS commands
Information on Nokia IPSO commands
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