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14.2.4 Simple Program to List a Directory

Here's a simple program that prints the names of the files in the current working directory:

     #include <stddef.h>
     #include <stdio.h>
     #include <sys/types.h>
     #include <dirent.h>
     main (void)
       DIR *dp;
       struct dirent *ep;
       dp = opendir ("./");
       if (dp != NULL)
           while (ep = readdir (dp))
             puts (ep->d_name);
           (void) closedir (dp);
         perror ("Couldn't open the directory");
       return 0;

The order in which files appear in a directory tends to be fairly random. A more useful program would sort the entries (perhaps by alphabetizing them) before printing them; see Scanning Directory Content, and Array Sort Function.