#include <stdio.h>
#include <stdlib.h>

int main(int argc, char**argv) {

  if(argc != 2) {
    fprintf(stderr, "Usage: %s <dirname>\n", argv[0]);
    return EXIT_FAILURE;
  }

  /* run command 'ls <dirname>' and output the result in f */
  char command[1024];
  snprintf(command, 1024, "ls %s", argv[1]);
  FILE *f = popen(command, "r");

  char* ret = NULL;
  do {
    char filename[1024];
    ret = fgets(filename, 1024, f);
    if(ret) {
      printf("new entry: '%s'\n", filename);
    }
  } while(ret);
  pclose(f);

  return EXIT_SUCCESS;
}