说明：  这份电子书里面有很多unix和linux的命令介绍,介绍简短而清晰,适合做查阅,而且是中文的,对大部分人来说看起来比较的舒服.
(this e-books, there are a lot of unix and linux orders presentation, brief and clear and suitable for inspection, and the Chinese, for most people seem more comfortable feeling.)