Helper binary that updates the password of a given user
' unix_update 'u unix_update [ . . .]
unix_update is a helper program for the pam_unix module that 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 system .
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 .