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

#include <sys/types.h>
#include <pwd.h>

int main()
{
  struct passwd *pwd;
  int count = 0;
  while(pwd = getpwent())
    {
      printf("Username %s: GECOS = %s, uid = %d\n",pwd->pw_name,pwd->pw_gecos,pwd->pw_uid);
      count++;
    }
  printf("There are %d users retrievable by getpwent(3)\n",count);
  printf("The output of 'wc -l /etc/passwd' is: ");
  fflush(stdout);

  system("wc -l /etc/passwd");
}