摘要：
1. sl命令你会看到一辆火车从屏幕右边开往左边。。。。。。安装 $ sudo apt-get install sl运行$ sl命令有 -alFe几个选项，-a An accident seems to happen. You'll feel pity for people who cry for help.-l shows little one.-F It flies.-e Allow interrupt by Ctrl+C.可以给别人来个恶作剧，他一敲ls，不知道的肯定很有效果$alias ls=sl2. fortune 命令输出一句话，有笑话，名言什么的 (还有唐诗宋词sudo 阅读全文