LINUX

9. What command can the current users execute to show a list of commands previously entered? Explain the utility of this command.

10. Which of the following describe a process (select all that apply):

a. a running program.

b. a running instance of a command.

c. identified by a Process ID number.

d. a potential program.

e. associated with a user account.

11. What are the results of using which for a command that is located a directory other than your current search path?

12. a. What command displays the current aliases?

b. Write an alias command to list only the hidden files within the current users home directory.

13. Explain the activity of the shell while a command is executing? How can you avoid waiting before running another command?

14. Enter the following command: $ sleep 30 | cat /etc/services

Is there any output from sleep? Where does cat get its input from? What has to happen before the shell will display a prompt?

15. Assume the PATH variable has been deleted, what are some of the problems that could arise? What is the reasons for these problems? What is the simplest way to restore PATH to its original state?

16. What can you do to make the function available every time you log in?