[Ilugc] One Day One GNU/Linux Command (WALL)

[Bharathi Subramanian]

One Day One GNU/Linux Command
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wall -- Send a message to everybody's terminal.

Summary :

Wall sends a message to everybody logged. The length of the message is
limited to 20 lines. You MAY need root permission, on some system, to 
run this command. This command is used to pass the some critical 
information to all.

Examples :

# wall "Welcome" -- Send the string "Welcome" to all.

# wall "System is going for a Reboot in another 5min. 
  Plz save your data and logout" -- Send the string to all.

# wall < message.txt -- Send the file content to all.

# wall -- Enter the message in stdin and terminate with Ctrl+D.

Read : man wall

HTH :)
-- 
Bharathi S