Broadcast message to login user through terminal

Let say you was unable to call your friend, maybe he forgot to bring his cellphone and you know he is login to a linux server doing something, and you have permission to ssh to that particular server, then you can write him a message.

First, type:

who

who will list of all user have login and and login to which terminal, you will see something like pts/0, pts/1.

Example output:

bob pts/0 2007-03-10 02:21 (:0.0)

With the information, now you can write messages to the user bob.

write bob pts/0

After typing the command line above, you can start to type your messages. When you hit enter, you message will be send to that terminal. Terminate the write by ctrl+D.

You can cat a file and pipe to write command too.

cat memo.txt | write bob pts/0

You can broadcast your message to all login user with wall command. wall, write to all.

cat announcement.txt | wall

Or simply type wall, then start to write your message. For wall, the message will be send only after you hit ctrl+D. And the message will be send to all users that login including you.

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