Which command is commonly used in Linux to display running processes?

The command commonly used in Linux to display running processes is 'ps.' This command stands for "process status." When executed, it provides a snapshot of current processes running on the system. It typically shows essential information such as the process ID (PID), the terminal associated with the process, CPU and memory usage, and the command that started the process.

Ps can be customized with various options to filter and format the output to show specific processes or extended information. For example, using 'ps aux' displays all running processes along with detailed information, regardless of their terminal association.

While other commands such as 'top' also provide information about running processes, 'top' continuously updates the display to show real-time information, making it different in usage. Commands like 'ls' and 'df' serve completely different purposes, with 'ls' listing files and directories, and 'df' displaying disk space usage. The option selected focuses specifically on listing active processes, which is why 'ps' is the correct choice.