View information about system processes.
> ps --long
--long: list all available columns for each entry
List the system processes
List the top 5 system processes with the highest memory usage
> ps | sort-by mem | last 5
List the top 3 system processes with the highest CPU usage
> ps | sort-by cpu | last 3
List the system processes with 'nu' in their names
> ps | where name =~ 'nu'