30 11 * * * export DISPLAY=:0.0; gnome-osd-client -f "<message id='bibi' hide_timeout='60000' osd_halignment='center'>电脑：爷，中午了，快去吃午饭吧！</message>"
00 18 * * * export DISPLAY=:0.0; gnome-osd-client -f "<message id='bibi' hide_timeout='60000' osd_halignment='center'>电脑：爷，您快下班了，要开始整理工作，准备下班了哦！</message>"
30 18 * * * export DISPLAY=:0.0; gnome-osd-client -f "<message id='bibi' hide_timeout='60000' osd_halignment='center'>电脑：爷，您已经下班了，该回家喽！</message>"
00 21 * * * export DISPLAY=:0.0; gnome-osd-client -f "<message id='bibi' hide_timeout='60000' osd_halignment='center'>电脑：我的爷！您还在加班？！别理那些万恶的资本家了，赶快回家休息吧！</message>"
sudo apt-get install gconf-editor
gconf-editor /apps/gmone-osd #设置默认效果