[Gllug] Preventing init 3 when a user is logged into X

[Dylan]

Hi all,

I did an update to a box today remotely because my lodger was working on 
it, and by habit I went to init 3 to apply the update. Unfortunately, 
this meant he lost a few minutes work on his document. No great shakes, 
but it prompts me to ask if I can connive to have init 3 only work if 
there is no user logged in on an X session on a remote box? I don't 
want to prevent it in general, just when a user is using X. Could I do 
the same for halt and reboot?

Obviously I'd want an error in case it was relevant...

Dylan
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