Zombie processes have Zero CPU consumption.ĥ. Zombie process: The processes which are already dead but shows up in process status is called Zombie process. The orphan process have “Init” process (PID 0) as their PPID (parent process ID)Ĥ. Orphan process: Sometimes when the parent gets executed before its own child process then the child process becomes an orphan process. The example is given above, the process having PID 28500(last row) is a child process of the process having PID 26544.ģ.
All child processes have a parent process. Child process: The process created by another process (by its parent process). All processes have a parent process, If it was created directly by user then the parent process will be the kernel process.Ģ. Parent process: The process created by the user on the terminal. There are five types of Process in Linuxġ. Now that you are familiar with the important commands used to manage Linux processes, Let’s jump into types of Linux process.
kill: Used to a process whose PID is known.Seventh column: CMD – the command that started that process.Sixth column: TTY – the Terminal type associated with the process.Fifth column: STIME – Process start time.Fourth column: CPU utilization of process.Third column: PPID (parent process Id) – PID of the parent process.Second column: PID (process Id) – this is the 5-digit number assigned by OS for a process.Here’s an example of a list of the process using ‘ps –ef’ To list all process in the background using ‘ps –f’ and to know more info on process use ‘ps -ef’ Process status(ps): displays all the process in execution Only after the background process becomes a foreground process, that process gets completed else it will be a stop state.īefore knowing about Types of process, Let’s know about basic commands used for process management in Linux. The background process will be in stop state till input from the keyboard is given (usually ‘Enter’ key) then becomes a foreground process and gets executed. While the process runs in the background, other processes can be run in the foreground. A background process runs on its own without input from the keyboard(stdin) and waits for input from the keyboard. Background process: Adding ‘&’ to a foreground command makes it a background process.When issuing this type of process, the system receives input from the keyboard(stdin) and gives output to the screen(stdout). When a process is run in foreground, no other process can be run on the same terminal until the process is finished or killed. Foreground process: By default, All the processes are run in the foreground.
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