I have a Linux server with about 20 users. They were using
wall command which is annoying. I have root permissions and still want to be able to use it myself. But, how can I restrict normal users from using the Linux
If you want to deny access to for all users, then you might want to remove the setgid bit on
You should always be able to wall yourself and root should be able to wall everyone, but user A won't be able to broadcast to the rest of the users.
Personally, I would find out why they are using wall, and then ask them to use a more appropriate service such as write or talk. If they are not willing to comply, then BOFH. Technology is not an answer in these cases.