The ps -ef command is a commonly used Linux command that provides a detailed list of all currently running processes in the system. We will examine how this command functions in this post and how to use it to manage and monitor processes on a Linux system. For illustration I will use Linux Mint 21 operating system but you can use any of the Linux distros. What is ps -ef command in Linux? By default, the ps command only displays processes that are running in the current terminal window. However, with the addition of the -ef option, the command displays all processes in the system, regardless of which terminal session they were started in. What does ps -ef command do? The ps -ef returns a list of all currently running processes on the system, along with information about each one, including its process ID (PID), parent process ID (PPID), initiating..