[Discuss] Most reliable method to test if x server is running in a Bourne Shell script

[gaf at blu.org (Jerry Feldman)]

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On 09/08/2011 03:47 PM, Ben Eisenbraun wrote:
> On Thu, Sep 08, 2011 at 03:33:55PM -0400, Jerry Feldman wrote:
>> But, the real issue is the line: testxworking. I want a short program
>> that returns 0 if an x server is present, and non-zero if not.
>
> $ xset q > /dev/null
> $ echo $?
> 0
> $ unset DISPLAY
> $ xset q > /dev/null
> xset: unable to open display ""
> $ echo $?
> 1
>
> I would check that xset is a required part of the Xorg base installation; I
> don't know off the top of my head. If not xset, then xrdb(1) or something
> along those lines must ride along with the base installation.
>
> -ben
>
> p.s. Putty setting DISPLAY when none exists is a bug.
>
xset works fine, thanks that is all I wanted to do.
Unfortunately all the windows weenies use putty. But, people can also
set DISPLAY erroneously. I tested it from a putty session without exceed
running. (I hate exceed and rarely use it).

xset q > /dev/null 2>&1 works for me in that script.



- -- 
Jerry Feldman <gaf at blu.org>
Boston Linux and Unix
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