今天学了一个有用的命令，写个备忘录：

在ubuntu中安装库文件之类的东西时，可以先按照关键词搜索。

比如，今天安装xcrysden-1.5.53-bin-semishared，

$ ./xCconfigure.sh   设置环境变量

$ ./xcrysden             运行测试

报错：error while loading shared libraries: libXss.so.1: cannot open shared object file: No such file or directory

说明少一个libXss.so之类的库，此时可执行

$ apt-cache search xss   #以xss为关键词搜索

出来一大堆：

libxss-dev - X11 Screen Saver extension library (development headers)
libxss1 - X11 Screen Saver extension library
libxss1-dbg - X11 Screen Saver extension library (debug package)
libapache2-modsecurity - Tighten web applications security for Apache
libghc-xss-sanitize-dev - Library to sanitize HTML and prevent XSS attacks - GHC libraries
libghc-xss-sanitize-doc - Library to sanitize HTML and prevent XSS attacks - documentation
libghc-xss-sanitize-prof - Library to sanitize HTML and prevent XSS attacks - GHC profiling libraries

选择安装第一个

$ sudo apt-get install libxss-dev

搞定！