Ask Ubuntu is a question and answer site for Ubuntu users and developers. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

In command line I wrote:

michael@ubuntu:~$ firefox

Firefox launched. Command prompt ($) disappeared.

Then I pressed ^+z.

The result was:

[1]+  Stopped                 firefox

Well, Firefox really stopped. It did not react anyhow. So, I could not close it by pressing the cross of the window. By the way, the menu items 'Tools', and 'Help' somehow showed some signs of life. They showed drop-down lists, but nothing more (no reaction to inner menu items).

Well, I could not end Firefox through System Monitor.

Could you comment on this case: what happened after pressing ^+z?

share|improve this question
up vote 5 down vote accepted

By pressing ^z ( Ctrl+Z ) you send a SIGSTOP signal to the process, which stops it. You can re-start it using the fg command (foreground) or make it continue to run in the background using the bg command.

share|improve this answer
Ctrl + Z suspends the process, in other words. – fromnaboo Oct 6 '12 at 10:20

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.