unix_update - Helper binary that updates the password of a given user
is a helper program for the pam_unix
updates the password of a given user. It is not intended to be run directly
from the command line and logs a security violation if done so.
The purpose of the helper is to enable tighter confinement of login and password
changing services. The helper is thus called only when SELinux is enabled on
The interface of the helper - command line options, and input/output data format
are internal to the pam_unix
module and it should not be called
directly from applications.
Written by Tomas Mraz and other various people.