类 Unix 系统下的一些常用命令和用法。

Github

http://www.jianshu.com/ 简书

http://www.jianshu.com/p/ffbbed22f984 Jekyll使用

lsof

An open file may be a regular file, a directory, a block special file, a character special file, an executing text reference, a library, a stream or a network file (Internet socket, NFS file or UNIX domain socket.) A specific file or all the files in a file system may be selected by path.