Processes and Job Control

Question 1

What command should we use to display current running processes?

Answer 1

ps

Question 2

How can we see all the processes (not only the ones for the current session) with ps?

Answer 2

ps -ef

Question 3

What command should we use for seeing the processes in a tree like view?

Answer 3

pstree

Question 4

What command should we use for an interactive process viewer?

Answer 4

top or htop (htop is not present in some Linux Systems)

Question 5

Which command should we use to run a command in the background?

Answer 5

command &

Question 6

How can we kill a process that’s currently running in the foreground?

Answer 6

CTRL+c

Question 7

How can we suspend a process that’s currently running in the foreground?

Answer 7

CTRL+z

Question 8

What command should we use to activate a suspended process in the background?

Answer 8

bg

Question 9

What command should we use to bring a process from the background to the foreground?

Answer 9

fg

Question 10

What command should we use to kill a process?

Answer 10

kill

Question 11

What command should we use to list all the current jobs?

Answer 11

jobs

Question 12

What is the kill signal number?

Answer 12

-15 is the kill signal, -9 is a force kill signal.