幹點小事的常用的着的語句

//int main(int argc,const char *argv[],const char **env[])

int main(int argc,char **argv)

{

    //help usage;argc-程式的參數counter,argument arg-counter,arg-value;

    if(argc<3){

        printf("Usage:%s old_name new_name\n",argv[0]);

        return;

    }

    //printf("%s\n",argv[1]);

    //printf("%s=%s\n",argc[1],argv[2]);//參數第二個

    if(rename(argv[1],argv[2])<0)

        printf("error!\n");

    else

        printf("ok!\n");

}