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 process 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. Identical to - e , below. This option is accepted for compatibility, but is ignored. Terminal identifiers are specified as a device file name, and an identifier.