[ydl-gen] how to get write privileges

[Kevin McMahon]

I am trying to change the yum.conf file and when I make a change it says 
i do not have write privileges, I am doing this as root and am not in a 
text editor, just open the file in the directory. I make a change to 
where yum will look for headers and I get the above, any clues... I try 
and open it with 'vim' as in vim yum.conf and it says vim not a command, 
i open the file with vi and there is nothing there... Hope you can help