Here are a few examples of using the “ ps -ef | grep processname” 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 “ps -ef | grep processname” Command Work in Linux? What you had psresult (ps -efgrep exe) runs ps grep, and captures the output. In this tutorial, we’ll explore how to combine the two commands to find desired processes and preserve the header line of ps ‘s output. Also, the grep command is good at filtering text. The second part filters the output to show only the processes that match the given process name or pattern. Overview We know that the ps command is a handy utility for listing the currently running processes on the system. The moment you run the command, there will be two such processes: the process certb itself and the process grep certb. In the “ ps -ef | grep processname” command, the first part of the command lists all the processes on the system. When you now run ps -ef grep certb you get a list of processes that contain the text certb somewhere. “ processname” is the name of the process or a pattern that we want to search for in the list of running processes.“ grep” is a command that searches for a given pattern or text within a file or output.“ |” is a pipe symbol that sends the output of “ps -ef” to the next command.The fgrep command on the other hand works on fixed string instead of a regex. “ ef” is an option for “ps” that tells it to show information about all processes, including those owned by other users, in a full format. The egrep command allows the use of extended regex.
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