Process Management

What is the range for nice values?

-20 to 19

What do you add to the end of a command to make it run in the background?

&

What command do you use to see running background jobs?

jobs

What is printed after you create a background job?

The job ID and the PID

What command do you use to move a background process to the foreground? What about the opposite?

fg jobid, bg jobid

What must you do before you turn a foreground process into a background process?

Get a job ID by pressing ctrl+z

What command do you use to edit a processes nice level as you launch it?

nice -n nlevel command

What command do you use to edit a processes nice level as its running?

renice -n nlevel PID

What switch do you use with renice to specify a users processes? What about a group?

-u, -g

What 3 commands can you use to kill processes?

kill, killall, and pkill

What is the syntax of the kill command?

kill -signal PID

What are the 4 common kill signals?

SIGHUP 1, SIGINT 2, SIGKILL 9, SIGTERM 15

What is the difference between killall and kill?

You don’t need to specify a PID with killall

What is special about pkill?

It is similar to pgrep

What is the syntax for pkill?

pkill -sig -f *

What command do you use to keep a process running even when logged out of the system?

nohup

What is the syntax for nohup?

nohup pname &

What file does nohup send stdout and stderr to?

nohup.out

How do you get rid of a zombie process?

SIGCHLD or kill the parent process