How can I enable/disable Dash online results programmatically?

command-line automation gsettings dconf unity-dash

You can use dconf-editor to change this setting. It's under: 

com -> canonical -> unity -> lenses

and is called remote-content-search. As far as I know there are only two options none and all. When set to all the slider is set to "On" in system settings and when it is set to none the slider is at the "Off" position.

You can change this via the terminal using gsettings. 

gsettings set com.canonical.Unity.Lenses remote-content-search all

Will turn it on while: 

gsettings set com.canonical.Unity.Lenses remote-content-search none

will set it to "Off".

Gsettings comes by default in Ubuntu and you can install dconf with: 

sudo apt-get install dconf-tools

You don't need dconf to use gsettings.

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