Re: gnuplot and DISPLAY

[Allin C. <cot...@wf...>]

On Thu, 8 Mar 2007, Ethan A Merritt wrote:

> On Thursday 08 March 2007 19:35, Allin Cottrell wrote:
>>>  bash-3.1$ echo "show term" | GNUTERM=dumb gnuplot_4.2
>>>
>>>     terminal type is dumb feed  79 24
>>
>> Yes, that works fine, only you have to parse the response; the
>> exit status seems to be OK regardless of the GNUTERM setting.
>
> Were you expecting an error exit status?  Why?
>
> I would not have expected an error exit from your original
> test run on gnuplot version 4.0 either.
> Failing to find a terminal is not a fatal error.
> It just returns you to the gnuplot command prompt.
> So when would you ever see an error exit?

I may have misdescribed the outcome, but in the context of a 
configure check this is what I had in mind:

echo "set term png" | gnuplot 2>/dev/null && echo "OK"
echo "set term foo" | gnuplot 2>/dev/null && echo "OK"

The first command echoes "OK", the second doesn't.  Thus I can get 
a reading on whether the term type is supported without having to 
parse any gnuplot output.

Allin Cottrell