>I'm going away on vacation, and I want to be able to configure my system
>from away.  How do I enable the root account to be accessable through
>telnet?

add some ttyp0, ttyp1,... in /etc/securetty

>I know I can su, but that doesn't give me access to all the
>commands I need (such as useradd).

when using su, you keep the environment of the user who issued su.
so try /usr/sbin/useradd

>
>Also, if I do this, is it going to pose a serious security problem?  My
>system has no sensitive data, it's just a personal PC, but I would like to
>know if it's open to the world or not if I enable remote root access.

it depends on _who_ wants to break in




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