Useful *nix Things

System

It is useful about users to know

• who they are, and maybe also
  
• what are they doing
  

this for security reasons, but also if you are planning any server maintenance or reboot, you will have to know

• who are logged, and
  
• what are they doing
  

to know if you can reboot the server in that moment, or have to wait (...here for more details)



last is another command for the system admin tool box, it displays the login history of all or any specific user (...here for more details)



There are some situations when you need to start a second X session on your computer(...here for more details)

Networking

Quick Howto