列出一个目录中的所有文件

 1 #include "apue.h"
 2 #include <dirent.h>
 3 int
 4 main(int argc, char *argv[])
 5 {
 6     DIR            *dp;
 7     struct dirent    *dirp;
 8     if (argc != 2)
 9         err_quit("usage: ls directory_name");
10     if ((dp = opendir(argv[1])) == NULL)
11         err_sys("can‘t open %s", argv[1]);
12     while ((dirp = readdir(dp)) != NULL)
13         printf("%s\n", dirp->d_name);
14     closedir(dp);
15     exit(0);
16 }