Dir

#include <dirent.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(int argc, char **argv) {
  DIR *d;
  struct dirent *child;
  if (argc != 3) exit(1);
  if ((d = opendir(argv[1])) == NULL) exit(1);
  while ((child = readdir(d)) != NULL) {
    if (child->d_type == DT_REG && strstr(child->d_name, argv[2])) printf("%s\n", child->d_name);
  }
  closedir(d);
  return 0;
}