wall

Send a message to all users connected to a tty.

Interface

wall [ -h ] message

This command sends a message to all connected users. It uses UTMP to find out which users are logged in. If the message contains spaces, it must be enclosed in quotes.

Exit codes

0 success
100 wrong usage
111 system call failed

Options

-h: prints this help;

Usage examples

Send a message to all connected users

66 wall "The system will be shut down in 5 minutes. Please, save your work and log out."