What is the shell how do I access the shell? The shell is a program that presents a command line interface which allows you to control your computer using commands entered with a keyboard instead of ...
sh（Bourne Shell）：由Steve Bourne开发，各种UNIX系统都配有sh。 csh（C Shell）：由Bill Joy开发，随BSD UNIX发布，它的流程控制语句很像C语言，支持很多Bourne Shell所不支持的功能：作业控制，命令历史 ...
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