Enable VNC and Screen Sharing in Mac OS X Lion 10.7 from the command line

sudo /System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Resources/kickstart     -configure       -allowAccessFor -allUsers -privs -all       -clientopts         -setvnclegacy -vnclegacy yes -vncpw mypass     -activate -agent -console

This sets the password to “mypass” and enables vnc.