Every time vim is used to edit a file, a command similar to: 1s/./g/will be automatically executed, and the first line of the file will be automatically replaced.
Presshttp://vim.wikia.com/wiki/TroubleshootingIt’s still the same after one pass.
This problem will not occur with vi.
Vimrc:

syntax on
 filetype indent plugin on
 set encoding=utf-8
 set fileencodings=utf-8,cp936,latin1
 set fileformat=unix
 set fileformats=unix,dos
 set number
 set modeline
 set tabstop=8
 set expandtab
 set softtabstop=4
 set shiftwidth=4
 set backup
 set backupdir=~/backup