DevOpsTheHardWay

Linux - Processes

Please answer the quiz and click the "Test" button at the bottom right.

Question 1

Which of the following is a true statement?

• Only the root user may run processes from a shell.
• The shell is a process that is commonly used to execute other processes.
• The shell is the kernel component that interacts directly with hardware.
• Only one instance of a shell may be running as a process.

Question 2

Which of the following is not true for the Linux operating system?

• Multiple processes appear to be running at the same time.
• Only one instance of any given program may be running as a process.
• Programs are stored as files in the filesystem.
• Only one instance of the kernel may be running at any given time.

Question 3

Open a new terminal session and type the command python. Then send a SIGINT signal using your keyboard. What best describes how the python process responds to the SIGINT signal? (you can exit this process by typing exit() in the python console)

• The program ignores the SIGINT signal.
• The program has implemented a custom signal handler for the SIGINT signal.
• The program behaves as the kernel's default signal handler for the SIGINT signal, which is to terminate the process.
• The program behaves as the kernel's default signal handler for the SIGINT signal, which is to stop (suspend) the process.
• None of the above

Question 4

Given a terminal session with a long process running in it, how will you ask this process to terminate?

• CTRL+z
• CTRL+c
• CTRL+l
• CTRL+c twice

Question 5

Given a terminal session with a long process running in it, how will you ask this process to stop?

• CTRL+z
• CTRL+c
• CTRL+l
• CTRL+c twice

Given the following output:

[maxwell@station maxwell]$ ps -U maxwell
PID  TTY    TIME    CMD
4785 ?      00:00:00 gnome-session
4828 ?      00:00:00 ssh-agent
...
4846 ?      00:00:00 xscreensaver
5410 pts/8  00:00:00 bash
5451 ?      00:00:00 same-gnome
5452 ?      00:00:00 same-gnome
5454 ?      00:00:01 gimp
5455 ?      00:00:00 script-fu
5463 pts/8  00:00:00 ps
5907 pts/7  00:00:00 bash
5942 pts/7  00:00:00 find

Answer the next 3 questions below.

Question 6

Which of the following commands would deliver a SIGTERM to the xscreensaver process?

• kill TERM xscreensaver
• kill 4846
• kill xscreensaver
• kill -9 4846
• None of the above

Question 7

Which of the following would deliver a SIGKILL to the xscreensaver command?

• kill -9 4846
• kill xscreensaver
• kill -KILL xscreensaver
• kill -15 4846
• None of the above

Question 8

Which of the following would send a SIGCHLD (signal number 17) to the ssh-agent process?

• kill -CHLD ssh-agent
• kill -17 ssh-agent
• kill -CHLD 4828
• All of the above
• A and C only

Question 9

Which key pressed within the top command allows the user to send a signal to a process?

• s
• z
• t
• k
• None of the above

Question 10

The kill command always terminates a process.

• True
• False