yppasswd - change login password in Network Information System (NIS)
The Network Information Service (NIS) was formerly known as Yellow
Pages (YP). The functionality remains the same; only the name has
yppasswd changes or installs a password associated with the login name
in the Network Information System (NIS). The NIS password can be
different from the one on your own machine. If name is omitted, it
defaults to the name returned by getlogin() (see getlogin(3C)).
yppasswd prompts for the old NIS password (even if it does not exist),
then twice for the new one. The old password must be entered
correctly for the change to take effect. Checks occur to ensure that
the new password meets the following construction requirements.
+ Only the first eight characters are significant.
+ A password can be as few as four characters long if it
+ at least one special character or
+ a mixture of numeric, uppercase and lowercase letters.
+ A password can be as few as five characters long if it
contains a mixture of
+ uppercase and lowercase letters or
+ numeric and either uppercase or lowercase letters.
+ A password must contain at least six characters if it contains
only monocase letters.
All these rules except the first are relaxed if you try three times to
enter an unacceptable new password. You cannot, however, enter a null
Only the owner of the name or the superuser can change a password.
The Network Information System password daemon, yppasswdd(1M), must be
running on the master NIS password server to change NIS passwords.
Hewlett-Packard Company - 1 - HP-UX Release 11i: November 2000
The password update protocol passes the old and new passwords to the
master NIS server at once. Thus, if the old NIS password is
incorrect, no notification is given until the new NIS password is
The yppasswd password construction rules are different from those of
the HP-UX passwd command (see passwd(1)).
User applications that call this routine must be linked with
/usr/include/librpcsvc.a. For example,
cc my_source.c -lrpcsvc
yppasswd was developed by Sun Microsystems, Inc.
id(1), passwd(1), su(1), yppasswdd(1M), getlogin(3C), yppasswd(3N),
Hewlett-Packard Company - 2 - HP-UX Release 11i: November 2000