Simplest portable vimrc imaginable

.vimrc

set expandtab

" the filetype plugin determines filetypes from file contents
filetype plugin on
" use indent rules based on the filetype
filetype indent on
" turn on syntax highlighting
syntax on

" guess indentation
set autoindent
" be even smarter with indentation
set smartindent
" tabstops are 2 characters
set tabstop=2
" autoindent uses 2 spaces
set shiftwidth=2
" insert spaces instead of tabs
set expandtab
" smart expansion of tabs into spaces
set smarttab
" show tabs and end of line characters
set list listchars=extends:❯,precedes:❮,nbsp:␣,tab:▸\ ,eol:¬,trail:→

" highlight search hits while typing
set hlsearch
" do incremental searching
set incsearch
" ignore cases while searching for lower case strings
set ignorecase
" do not ignore cases when searching for a string containing one or more upper @
" case letters
set smartcase

" show a message when in insert and visual modes
set showmode
" show matching braces
set showmatch

" show tab lines 0: never 1: only if there are >= 2 tabs 2: always
set showtabline=1
set number
set relativenumber

" use tab to switch between buffers
noremap <tab> :bnext<enter>
noremap <s-tab> :bprevious<enter>

curl https://gist.githubusercontent.com/pletnes/1541ce8cef4281c90bf2b529c5567698/raw/4255a0649bcc5795ceb14254ec50b22d80898e08/.vimrc > ~/.vimrc