Runlevel S is not really meant to be used directly, but more for the scripts that are executed when entering runlevel 1.
Runlevel S abụghị n'ezie na a ga-eji ya mee ihe kpọmkwem, kama ọ bụ maka ihe ederede ndị a na-egbu mgbe ị na-abanye runlevel 1.