lfs-book-zh_CN/chapter06/config-shadowpwd.xml

<sect2><title>Configuring Shadow Password Suite</title>

<para>
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.
</para>

<para>
To enable shadow'ed passwords, run the following command:
</para>

<para>
<screen>
<userinput>/usr/sbin/pwconv</userinput>
</screen>
</para>

</sect2>