How to enable screen sharing (vnc) from terminal (ssh connection)?

Hi,

Setting the scene:

I installed Lion on my office iMac a couple of days before leaving on vacation.

Now on a remote location on holiday, I cannot share the screen of my office mac anymore. This was possible before the upgrade to Lion.

I'm still able to ssh to my office iMac, so I have some control...

Problem:

I want to check the Systems Preferences settings via terminal (the ssh session). How can I do this?

I suppose VNC is just switched off due to the upgrade, and I want to remotely enable screen sharing (and vnc) from the Terminal.

A google search tells me how to do this for 10.6, but not howto for 10.7.

Hope somebody can help.

Thanks,

Stefan.