The wall command can be used to write a message to every Terminal window
currently open on a computer, including your own.
This type of thing would be useful if you wanted to warn people about an
impending shut down, but it can also be a fun way to mess with your coworkers
(though, I may have a warped sense of fun…).
The ability to send a message is brought up with wall, and the message is
sent using Cntrl+D (note: on a Mac it is indeed Cntrl and NOT command).
This allows you to use enter to break up information into paragraphs if you so wish.
kevin@raphael$ wall
I thought it\'d be fun to send myself a message via Terminal, because I\'m ridiculous. So here I go.
WHY AM I LIKE THIS?
Lyk this iff u cri evertim
Broadcast Message from kevin@raphael
(pts/7) at 20:34 CST...
I thought it\'d be fun to send myself a message via Terminal, because I\'m ridiculous. So here I go.
WHY AM I LIKE THIS?
Lyk this iff u cri evertim
my_mac_computer:~ Owner$
The first iteration is what I sent, and the Broadcast Message is the message
that everyone received (because I received a copy when I sent it).
It includes who sent it (kevin@raphael) and which Terminal it was sent
from (pts/7).