If you need to start, stop, or restart IIS from the command line, the quickest option is to use iisreset.
Commands
Start IIS:
iisreset /start
Stop IIS:
iisreset /stop
Restart IIS:
iisreset
Note
iisreset restarts the entire IIS service, so use it with care on shared or production servers. If you only need to restart a specific site or application pool, IIS Manager or PowerShell may be a better option.