Problem : Need to edit /etc/fstab while in single user mode, unable to 
do so.

Version NetBSD 3.0.1  i386

I made a mistake editing my fstab file, on boot up NetBSD drops into 
single user mode. All I need to do is comment out the offending line 
using # and all should be fine again. The line is not over critical in 
the day to day use of  the system (I was trying to mount an NTFS 
partition). However I am not sure how to edit a file from single user mode.
I can mount / ok. 
When I try to use vi as
vi /ect/fstab
the message tells me

 TERM variable is not set (or similar)

I investigated and found you could set the TERM variable using the command

TERM=
and this should enable you to use vi

However I am unsure what my terminal (variable) is , or how to find that 
out. I am using a stand alone desktop with just one user account and root.

thanks for your help in advance,

Alasdair