How to change the default program which open the 2D picture which the plot producted?
I'm using SageMath4.7.2 in Ubuntu10.04. When I called the plot() to draw the 2D picture of some functions in command line of SageMath(not the GUI session in web browser), SageMath show the pictures in evince,which is my PDF files reader. My default picture viewer in Ubuntu is set to gpicview, not evince. When I delete the evince?SageMath call the ImageMagic to display the result. But I need evince to read ebooks, so I installed the evince again. After that the SageMath still call evince to display the 2D pictures. I wonder are there any method to change the default program to open the 2D pictures in SageMath? PS: My mother language is Chinese, not English, so please forgive me for my language errors. Thanks!