2.9BSD - /usr/include/pwd.h

   1: struct  passwd { /* see getpwent(3) */
   2:     char    *pw_name;
   3:     char    *pw_passwd;
   4:     int pw_uid;
   5:     int pw_gid;
   6:     int pw_quota;
   7:     char    *pw_comment;
   8:     char    *pw_gecos;
   9:     char    *pw_dir;
  10:     char    *pw_shell;
  11: };

Defined struct's

Usage of this include