practices/dirshow.c

#include <error.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <dirent.h>


int
main (int argc, char *argv[])
{
	  DIR *dp;
	    struct dirent *ep;
	if(argc==1){
		perror("Usage program base/path");
		exit(1);
	}
	      dp = opendir (argv[1]);
	        if (dp != NULL)
			    {
				          while (ep = readdir (dp)) {
						          puts (ep->d_name);
							  if(strcmp(ep->d_name, ".")==0 || strcmp(ep->d_name, "..")==0)
								  continue;
							 if(ep->d_type==DT_DIR) {
								 char *subdir = malloc(strlen(argv[1])+strlen("/")+strlen(ep->d_name)+1);
								 strcpy(subdir, argv[1]);
								strcat(subdir, "/");
								strcat(subdir,ep->d_name);
								char *newargv[] = {NULL, subdir};
								main(2,newargv);
							 } 
					  }
					        (void) closedir (dp);
						    }
		  else
			      perror ("Couldn't open the directory");

		    return 0;
}