Linux练习（处理程序命令行参数）

#include <stdio.h>

#include <unistd.h>

int main(int argc,char **argv)

{

        int opt;

        while((opt=getopt(argc,argv,"if:lr"))!=-1)

        {

            switch(opt)    

            {

                    case 'i':    

                    case 'l':

                    case 'r':

                            printf("option:%c\n",opt);

                            break;

                    case 'f':

                            printf("filename:%s\n",optarg);

                            break;

                    case ':':

                            printf("option needs a value\n");

                            break;

                    case '?':

                            printf("unknown option:%c\n",optopt);

                            break;

            }

            for(;optind<argc;optind++)    

                    printf("argument:%s\n",argv[optind]);

            exit(0);

        }

}