The ps command prints information about active processes. Without options, ps prints information about processes asso- ciated with the controlling terminal. The output contains only the process ID, terminal identifier, cumulative execu- tion 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. Write information for all processes. Print information about all processes except session leaders. Print information about every process now running.