Linux system ABCD vi after clicking the arrow keys, the cursor does not move

Terminal (terminal) input

　　vi / etc /vim/vimrc.tiny

Modify the open file

　　1. The set compatible amended as set nocompatible

　　Add the next line set backspace = 2

Save it. Run the management appeared to read-only status when saving, terminal type:

　　its

You will be prompted to enter the root password. Input can be.

Then again perform the above modifications.