shadow/man/login.defs.d/TCB_SYMLINKS.xml

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<varlistentry condition="tcb">
<term><option>TCB_SYMLINKS</option> (boolean)</term>
<listitem>
<para>
If <replaceable>yes</replaceable>, the location of the user tcb
directory to be created will not be automatically set to /etc/tcb/user,
but will be computed depending on the UID of the user, according to
the following algorithm:
<programlisting>
if ( UID is less than 1000) {
use /etc/tcb/user
} else if ( UID is less than 1000000) {
kilos = UID / 1000
use /etc/tcb/:kilos/user
make symlink /etc/tcb/user to the above directory
} else {
megas = UID / 1000000
kilos = ( UID / megas * 1000000 ) / 1000
use /etc/tcb/:megas/:kilos/user
make symlink /etc/tcb/user to the above directory
}
</programlisting>
</para>
</listitem>
</varlistentry>