Processes and Job Control

Question 1

to list processes currently running type this command:

Answer 1

ps

Question 2

additional ps Options:

Answer 2

ps -e everything, all processes
ps -f full format listing
ps -ef Display all processes, full
ps -u username display username’s processes
ps -p pid display information for PID
ps -eH Display a process tree
ps -e –forest Display a process tree
pstree displays processes in a tree format
top Interactive process viewer
htop Interactive process viewer (less common not in all Distros)

Question 3

To run processes in the background:

Answer 3

“command” & start’s the command in the background
Ctrl-c kill the foreground process
Ctrl-z Suspend the foreground process

Question 4

Background a suspended process

Answer 4

bg [%num]

Question 5

Foreground a background process

Answer 5

fg [%num]

Question 6

Kill a process by job number or PID

Answer 6

kill

Question 7

to list jobs

Answer 7

jobs [%num]

Question 8

send a kill signal to a process

Answer 8

kill [-sig] pid
ex:
pid sig pid sig pid
kill 123 kill -15 123 kill -TERM 123 or use -9 to terminate

Question 9

to display a list of kill signals

Answer 9

kill -l