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。

本文以Mandrake Linux 9.1(Kenrel 2.4.21)为例，介绍Linux下的安装和登录命令。-Linux provides a large number of commands to use it can effectively accomplish a lot of work , such as disk operations , file access , directory operations , process management, file permissions set . So, working on a Linux system can not be separated using the command provided by the system . To truly understand the Linux system must learn from the Linux command-based command- learning can further understand the Linux system .

The command number of different Linux distributions are not the same, but the command has more than 200 Linux distributions the least . Here the author is more important and the most frequently used commands, divided into the following six parts according to their role in the system introduced one by one .

Mandrake Linux 9.1 (Kenrel 2.4.21) , for example , introduced under the Linux installation and login command .