CLI - how can I specify a screen saver with the following options?
Firstly, set your screensaver to Flurry in System Preferences and check the checkbox to show the clock.

Open up the terminal and type

sleep 900;/System/Library/Frameworks/ScreenSaver.framework/Resources/ScreenSaverEngine.app/Contents/MacOS/ScreenSaverEngine&amp;


In 15 minutes, the screensaver will activate with Flurry and show the clock.

The sleep 900 line controls the delay, so 900 is 15minutes in seconds (15*60).

You could add an alias for this command in your ~/.bash_profile so that you don't need to type this large command every time.  eg if you wanted to have ss be the command then enter this into the ~/.bash_profile

alias ss='sleep 900;/System/Library/Frameworks/ScreenSaver.framework/Resources/ScreenSaverEngine.app/Contents/MacOS/ScreenSaverEngine&amp;'


Hope this helps.