This section mainly talks about more advanced use to modify the commit history in local environment.

In some cases, you are connected to a remote machine via SSH and perform a log-running task, and suddenly your SSH connection drops. If you have experienced this before (sadly I have), then screen is your best tool. Screen is a terminal multiplexer that allows us to resume the dis-connected sessions. You can create multiple terminal sessions and share your screen with other users using the screen.

Summarise the abbreviations used in this course.

Introduce the contributors for this series of notes

What is computer security? What is the history of computer security? Where does computer security come from? Why do we need computer security?