Linux提供了大量的命令，利用它可以有效地完成大量的工作，如磁盘操作、文件存取、目录操作、进程管理、文件权限设定等。所以，在Linux系统上工作离不开使用系统提供的命令。要想真正理解Linux系统，就必须从Linux命令学起，通过基础的命令学习可以进一步理解Linux系统。

不同Linux发行版的命令数量不一样，但Linux发行版本最少的命令也有200多个。这里笔者把比较重要和使用频率最多的命令，按照它们在系统中的作用分成下面六个部分一一介绍。

-Linux provides a large number of orders, it can be effectively completed a lot of work, such as disk operations, file access, directory operations, process management, file permissions and other settings. Therefore, in working on Linux systems can not be separated from the use of system commands. To really understand Linux systems, we must learn from the Linux command through a command-based learning can be a better understanding of Linux systems. Different Linux distributions the number of different orders, but the Linux release at least an order also has more than 200. Here the author is more important and the most frequently used commands, in accordance with their role in the system is divided into six parts each of the following introduction.