If I'm logged in as joe and I need to do something as root, I do a 'su' and
enter the root passwd. If I want to run some X application, say Filerunner,
then I have no problems.
Given the same scenario, If I 'su -' I cannot run the X application as the
DISPLAY env is not set.
This set me out to learn where the DISPLAY env variable is set. I cannot
find it. Where / how is it set ?
Also, is the reason there is a difference between the behavior of 'su' and
'su -' with regard to DISPLAY is that the 'su' would inherit the DISPLAY env
from Joe, where as root has no DISPLAY env ? What's the reason for root
not having a DISPLAY env ?
Trying to understand,
Mike
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