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);
}
}