The defunct flag tells you that this is a dead, zombie process. This command will give you the state, parentID, the process ID, the program that is running the zombie process(a dummy program by the name ‘zombie’ on my system). If you want further details about the zombie process, use the following command: $ ps axo stat,ppid,pid,comm | grep -w defunct You can see in the second line that there is 1 zombie process running on my system. I got the following output after running this command. Open the Terminal by pressing Ctrl+Alt+T and then type top. It also gives you information about any zombie processes running on your system. The top command displays a detailed view of the processes running on your system along with the memory and CPU resources they are using. It is also possible that the number of zombie processes on your system might be less or more than the ones running on mine. In the following screenshot of my System Monitor, you can view that there are two zombies running on my system. In order to graphically view any zombie processes running on your system, open the System Monitor utility through your Ubuntu Dash. Through the Command Line Through the GUI.Ubuntu allows you to view these processes in the following way: You can check your system’s performance by looking at the various processes running on your system, including efficiency-altering zombie processes. This tutorial is compatible with all recent Ubuntu versions including Ubuntu 22.04. In that case, you might have to kill these zombies manually through the ways and commands described in this tutorial. These zombie processes might accumulate, in large numbers, on your system and affect its performance. However, if the parent fails to call the wait function for any of its children, the child process remains alive in the system as a dead or zombie process. When the child process has finished, the wait function signals the parent to completely exit the process from the memory. Usually, a parent process keeps a check on the status of its child processes through the wait() function. A zombie or a defunct process in Linux is a process that has been completed, but its entry still remains in the process table due to a lack of correspondence between the parent and child processes.
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