Here are a few examples of using the â ps -ef | grep processnameâ command with different options and arguments to filter and display the output: Example 1: Find the ID of a Specific ProcessĪn example is considered to find out the process id of the specific process in the terminal. How Does âps -ef | grep processnameâ Command Work in Linux? The second part filters the output to show only the processes that match the given process name or pattern. In the â ps -ef | grep processnameâ command, the first part of the command lists all the processes on the system. Right angle bracket ( >) redirects the output to a file called catch. You can't kill it because it is already dead. These processes will be destroyed by init (8) if the parent process exits. In this case, the regular expression is, which the shell will expand to the process ID of the current shell. Manual page ps (1) says: Processes marked are dead processes (so-called 'zombies' ) that remain because their parent has not destroyed them properly.grep matches lines which match a regular expression.
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