Using Linux ps, pipe, grep and kill Commands

The "ps -ef" command will display a list of all running processes, the pipe "|" command takes the output of one command and inputs it to the next command and the "grep" command searches files for text strings. In this demonstration I simulate a locked up text editor, Kate, and use "grep kate" to search for the process ID (PID) of the kate process in order to close it with the "kill -9" command.