[X-Unix] trigger software suspend (aka hibernation mode) from Terminal?

[TjL]

Never has one idea had so many names:

software suspend
safe sleep
hibernation (Windows)

It's the state that your Mac is in when:

	1) All the memory has been written to disk

	2) No battery is being used at all

I found an app:

Deep Sleep	
http://www.macupdate.com/info.php/id/20120

which supposedly does this, but what I want to be able to do is run  
it via shell script (so that after my nightly backups the computer  
will go into this mode).

Anyone know if this is possible?