"Fossies" - the Fresh Open Source Software archive 
pwupdate is invoked by rpc.yppasswdd(8) after changing the password and it should update the passwd and shadow NIS map. Never run it by hand.
shadow
Normally, only the passwd map will be updated. With this option, pwupdate will update the shadow map, too.
/etc/passwd, /etc/shadow
rpc.yppasswdd(8), ypserv(8)
Olaf Kirch <okir@monad.swb.de>, Thorsten Kukuk <kukuk@suse.de>