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What means '-s' that in 'Shutdown -s -t'

i want to know about [Shutdown -s -t] Shutdown means 'shutdown'
-t means 'Time' but what means '-s'?? system?? or start?
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i want to know about [Shutdown -s -t] Shutdown means 'shutdown'
-t means 'Time' but what means '-s'?? system?? or start?
Comments
on CentOS like systems that is not a valid argument
See
Also not a valid option on Ubuntu.