mesg

Check or set a terminal's ability to receive messages from other users, usually from the write command. See also write, talk. More information: https://manned.org/mesg.1.

• Check terminal's openness to write messages:

mesg

• Disallow receiving messages from other users:

mesg n

• Allow receiving messages from other users:

mesg y

• Enable [v]erbose mode, printing a warning if the command is not executed from a terminal:

mesg --verbose