Checking for X availability

Flavio codeco coelho fccoelho at
Tue Jan 11 06:32:01 EST 2005

I have a program that uses pythondialog for its UI.

Pythondialog is a wrapper of the shell dialog and xdialog libs.

But I would like for it to switch between using Dialog ( when X is not
available )  and xdialog (when X is available)

So my question is: how can I check for the availability of X? i.e.,
How will my program know if its running in a text only console or in
console window over X?



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