The ps command prints information about active processes. Without options, ps prints information about processes that have the same effective user ID and the same controlling terminal as the invoker. The output contains only the pro- cess ID, terminal identifier, cumulative execution time, and the command name. Otherwise, the information that is displayed is controlled by the options.
Some options accept lists as arguments.
Items in a list can be either separated by commas or else enclosed in quotes and separated by commas or spaces. Values for proclist and grplist must be numeric. List information for all processes. Identical to -e, below. List information about all processes except ses- sion leaders.