In Linux, how does one broadcast messages to all other users logging on to the same machine?

In Linux, how to broadcast messages to all other users logging on to the same machine-Linux Enterprise Application-Linux server application information is described below. Many people share some machines in the local area network. However, if multiple people use the same machine at the same time, some conflicts may occur, such as some system configurations being modified, this causes some trouble. Before using this machine, send a message to all other users who have logged on to the machine, telling other users (if any) that you will use this machine. In this way, if other users log on to the machine, they will receive the message. This effectively avoids conflicts.

First, you can run the who command to view all users logging on to the machine. For example:

# Who

Root pts/0 Jun 13 (10.56.226.25)
Root pts/1 Jun 13 22:32 (10.140.1.37)
Root pts/2 Jun 13 23: 31 (10.140.2.70)
Root pts/3 Jun 13 23: 56 (10.140.2.70)

If you run the who command, the above result is returned. Indicates that three users have logged on to the machine and two users have logged on to the Console.

Second, broadcast messages

# Wall 'I will use this host. If somebody is using it, pls let me know. Thanks a lot .'

Broadcast message from root (pts/3) (Fri Jun 13 23:57:13 2008 ):

I will use this host. If somebody is using it, pls let me know. Thanks a lot.

Run the wall command to receive the message shown above on all the console interfaces that log on to the machine.