练习使用vi，使用UNIX的系统调用和库函数，体会UNIX文件通配符的处理方式以及命令对选项的处理方式。与ls命令类似，命令行参数可以有0到多个,实现自定义选项r,a,l,h,m以及--. ——北京邮电大学计算机系Cc-Practice to use vi, use the UNIX system calls and library functions, experience of UNIX file handling of wildcards, and command of the options approach. With the ls command similar to the command line parameters can have 0 to many, to achieve a custom option r, a, l, h, m, and--.- Beijing University of Posts and Telecommunications Department of Computer Cc