Lists jobs and their i.d. numbers. If the prompt is returned without any additional information, you have no jobs running.
A job can be created by placing an & after a command, which makes the command executable in a background mode. For example: xwebster& allows one to keep the window where the command has been typed active, even while the xwebster process is also still active.
<CONTROL> Z stops a running process, but does not
kill it. bg will restart a stopped job and put it in the
background, giving control to the window you were in. fg will
restart a stopped job and put it in the foreground, giving control to
<CONTROL> C will then kill a job if necessary.
Another way to kill a job is to first find the number of the job you wish to kill by typing jobs. Then, to kill, say job number 5, which was listed, type kill %5.
 Stopped xwebster +
 - Running xcalc
 Running mosaic
To kill xwebster, job #1 listed above, type kill %1.