Most (but not all) shells support some form of control over background processes. Important features include the following:
Listing current background programs
Pausing running programs
Stopping running processes
Bringing to the foreground programs sent to the background
Controlling background programs is called job control.
Use job control to manage multiple running programs. You can start programs in the background from the bash shell command line with the & operator, or you can suspend a program by pressing Ctrl+z. The shell will respond by printing a job number, followed by a process number of the program:
$ sc &  2689
Running programs sent to the background with Ctrl+z will disappear, and the shell ...