誰有以下實現的代碼!
编写一个小型的shell(由命令行解释),实现下面标准的要求。(Write a miniature shell (command line interpreter) with the following standard features implemented:
1。I/O重定位(I/O redirection)
2。管道行过滤器(pipe line filters)
3。前台和后台处理(foreground background processing)
4。处理管理快捷(process management short cuts.)
5。环境变量。(environment variables.)