84、Start the screensaver from the command-line(在终端中开启屏保)

    gnome-screensaver-command –a

86、View images at the command-line(在终端察看图片)
To quickly view a picture from the command line, just type eog filename. To view the picture full-screen, type eog -f filename.
(输入eog filename,察看图片filename.全屏察看输入 eog –f filename。(终端自动调用GNOME之眼察看图片))