Hi,
Im a programm with no to little knowledge about Linux. Basicaly, we have a "linux man" here, but he is out of town for some days and thus, Im stuck with my own work.

This time I just have to programm a simple gui, that calls/starts a couple of scripts, who do all the work.

Now, when I write

in the console (/bin/bash). It works (its a simple picture viewer, openSUSE 12.2).

But when I run a script that looks like this:
I get the following error:
No protocol specified
Error, cant open display

When I issue the command in the console, the script works. However, the app isnt started from a console and do not open a console, so this is not a solution. I changed the script to
But get the error: xhost: unable to open display ":0.0"

Of course, the script dont work when started by my app (however, when my app just executes eog, it works). The question is, what can I do?

Thanks

PS: found a lot of answers to the "no protocol specified" and "unable to open display" problem on the net, however not one helped me.

When you simply run eog cmd from terminal, it takes default DISPLAY variable set in you shell. But when you put the same inside a shell script, it don't find the DISPLAY variable.

So once invoke echo $DISPLAY in terminal and check value of DISPLAY variable. It should be either like, localhost:0.0 or in form of homstname.somoething.something:X.X

So then define the same value of DISPLAY variable in your script, as:
#!/bin/bash
DISPLAY=<value> (Put value that you find using echo $DISPLAY)
export DISPLAY
eog

Note: Command xhost+ is used to allow other host to access your X i.e. you allowed them & they can run thier X-applications/tool on your desktop. But it don't make any sense when you're running an X-application in your own machine. Also, don't use "xhost +", as it will allow everyone to run thier X-application on your machine, instead use "xhost +<remote-hostname>" to allow only a host <hostname> to access your dekstop.

1 members found this post helpful.

Yes thats it thanks.

Using the hints in all the other posts I found, i used DISPLAY=0:0, but this time just what echo said and its :0 and it works.

Also thanks for the clarification on the usage of xhost.

Happy to hear this . To revert xhost changes, just invoke "xhost -" command.