[sf-perl] determining console or xwindows mode

[David Alban]

caveat:  you can be running under X and not have your $DISPLAY set.
not optimal, but it happens.

consider also checking for X11 libs and/or an X server process in the
process table.

On Sun, Feb 28, 2010 at 6:58 PM, Quinn Weaver <quinn at fairpath.com> wrote:
> If you're running under X, the DISPLAY environment variable should be set.
> So do:
>
> if ($ENV{DISPLAY}) {
>    ...

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