All command lines begin with the executable pstcli. If you do not start each command line with pstcli, the command fails and you must rerun the command. If you run only pstcli, without any switches or commands, the list of switches and their descriptions is displayed.
If you are in session mode, you do not have to include pstcli in the command line. Also, you can press TAB after typing the first letter of the switch to autocomplete the switch.