1. What is the difference between built-in (internal) and external shell commands? How does a UNIX shell execute built-in and external commands? Explain your answer with an example.

2. Name 2 different categories of information that can be found using the ps command?

3. What is the purpose of the nice command?

4. Give the sequence of steps (with commands) for terminating a background process.

5. Show the command for displaying the process tree on your system for

a. All the processes running on your system

b. All of YOUR processes running on the system

6. Explain what are well-known ports? List the well-known ports numbers for the following Internet services: http, ftp, telnet, smtp, ssh.

7. What command(s) would you use to display information about the CPU and OS in Linux?

8. How would you display information about the user chris at the host mit.edu using the finger command?

9. What is anonymous ftp? How would you establish an anonymous ftp session with the host ftp.intel.com?

10. What is the purpose of the ssh command?