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 Displaying processes

 Running processes in the foreground and background

 Killing and renicing processes

In addition to being a multiuser operating system, Linux is a multitasking system. Multitasking means that many programs can be running at the same time. An instance of a running program is referred to as a process. Linux provides tools for listing running processes, monitoring system usage, and stopping (or killing) processes when necessary.

From a shell, you can launch processes and then pause, stop, or kill them. You can also put them in the background and bring them to the foreground. This chapter describes tools such as ps, top, kill, jobs, and other commands for listing and managing processes.