vim

$ cat .vimrc
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filetype plugin indent on
" show existing tab with 4 spaces width
set tabstop=2
" when indenting with '>', use 4 spaces width
set shiftwidth=2
" On pressing tab, insert 4 spaces
set expandtab
" On line number
set number
" On show special char (tab and line end)
set list
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# if you hide line number
set nonumber
# if you hide special chars (etc line end $ mark)
hide special char : set nolist