#include<stdio.h>    // for printf()   NULL
//#include"error.c"
//#include"apue.h"
#include<dirent.h>  //for DIR dirent  opendir()  readdir()  

#include<stdlib.h>  //for exit();
int  main(int argc,char*argv[])
{
  DIR *dir=NULL;
 struct  dirent * dirp=NULL;
 if(argc!=2)
{
    printf("the consle order is error\n");
    exit(0);
}
if((dir=opendir(argv[1]))==NULL)
{
   printf("is the directory name");
   exit(0);
}
while((dirp=readdir(dir))!=NULL)
   printf("%s\n",dirp->d_name);

  exit(0);
}
 

執行結果