070 尚硅谷课程系列之linux 扩展篇 Shell编程（三） 变量（三） 全局变量、只读变量和撤销变量
Synopsis
Linux作为一款经典的开源软件，已经成为服务器操作系统的首选。Linux继承了Unix简约高效的设计风格，性能强大，安全稳定， ...
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