This package contains the utilities to modify user's passwords, add new users/groups, delete users/groups and more. We're not going to explain what 'password shadowing' means. All about that can be read in the doc/HOWTO file within the unpacked shadow password suite's source tree. There's one thing you should keep in mind, if you decide to use shadow support, that programs that need to verify passwords (examples are xdm, ftp daemons, pop3 daemons, etc) need to be 'shadow-compliant', eg. they need to be able to work with shadow'ed passwords. To enable shadow'ed passwords, run the following command: /usr/sbin/pwconv