#include <pwd.h>
main ()
{
 struct passwd *p;
 while(p=getpwent ())
 printf("%s:%s:%d:%d:%s:%s:%s\n", p->pw_name, p->pw_passwd,
  p->pw_uid, p->pw_gid, p->pw_gecos, p->pw_dir, p->pw_shell);
}