Write to All Users

Write to All Users

The superuser can use the wall(1) command to write to all the users who are logged in on the system. This useful when you need to announce that you are bringing the system down.

To use wall, enter:

wall

Enter your message. Press <Ctrl-D> when you are finished, and wall sends the message.

You can also compose the message in a file, then send it using wall:

wall < messagefile

The wall command is not affected by a user's mesg setting. That is, a user cannot stop wall from displaying on his or her screen. On a graphics display with multiple windows, the message is displayed in all windows.

Chapter 5 provides information on configuring your system disk space for maximum effectiveness, including allocating swap space for the operating system kernel. Topics described in this chapter include:

Disk usage information commands
Using disk quotas
Using NFS and disk partitions to manage disk space
Setting and increasing system swap space

Chapter 6