Open WPS in command line:
1.Open the writer:
$wps //open a new empty word
or
$wps a.wps //open a.wps
or
$wps a.wps & //open a.wps in background
2.Open the spreadsheet:
$et
$et a.et
$et a.et &
3.Open the presentation:
$wpp
$wpp a.wpp
$wpp a.wpp &