yppasswd - change password in Network Information Service (NIS)
If Enhanced Security is enabled on your system, use the passwd command to change your password, even if NIS is in use.
The yppasswd command lets you change your password in the Network Information Service (NIS) map, a network data base service. Only you or the superuser can change your NIS password.
When you enter the yppasswd command, the program prompts you for the old password and then for the new password. Note that the passwords are not displayed on the screen.
Next, the program asks you for the new password again, to verify that you have typed it correctly. If you do not type the passwords correctly, you will receive an error message after you enter the new password.
Your new NIS password must meet one of the following requirements: It must be a combination of at least six alphanumeric characters, or It must be a minimum of four characters, with at least one being non-alphanumeric, such as a control sequence.
The passwd command does not change the NIS password. This command only changes the local password file (/etc/passwd), and not the NIS master password file.
Your new password does not meet the minimum length requirement.
You misspelled your new password or its verification.
Your new password can not be activated. It must be different
from your old password and your login name.
passwd(1), passwd(4), ypfiles(4), yppasswdd(8)