shell script to run arch linux on ChromeOS, based on https://gist.github.com/4140706

.bashrc

# Test for an interactive shell.  There is no need to set anything
# past this point for scp and rcp, and it's important to refrain from
# outputting anything in those cases.
if [[ $- != *i* ]] ; then
  # Shell is non-interactive.  Be done now!
  return
fi
# Put your fun stuff here.

if uname -a | grep -q SAMSUNG ; then
  echo "Booting into ChromeOS Linux"
  sudo mount -i -o remount,exec /home/chronos/user/  
else
  echo "Welcome to Arch Linux: `uname -a`"
# Configure colors, if available.
if [ -x /usr/bin/tput ] && tput setaf 1 >&/dev/null; then
  c_reset='\[\e[0m\]'
  c_user='\[\e[1;33m\]'
  c_path='\[\e[0;33m\]'
  c_git_cleancleann='\[\e[0;36m\]'
  c_git_dirty='\[\e[0;35m\]'
else
  c_reset=
  c_user=
  c_git_cleancleann_path=
  c_git_clean=
  c_git_dirty=
fi
# Function to assemble the Git parsingart of our prompt.
git_prompt ()
{
  if ! git rev-parse --git-dir > /dev/null 2>&1; then
  return 0
  fi
  git_branch=$(git branch 2>/dev/null | sed -n '/^\*/s/^\* //p')
  if git diff --quiet 2>/dev/null >&2; then
  git_color="$c_git_clean"
  else
  git_color="$c_git_dirty"
  fi
  echo "[$git_color$git_branch${c_reset}]"
}
# Thy holy prompt.
PROMPT_COMMAND='PS1="${c_user}\u${c_reset}@${c_user}\h${c_reset}:${c_path}\w${c_reset}$(git_prompt)\$ "'
fi
alias go="~/local-dev/scripts/go"
alias godev='cd ~/local-dev'
alias gonode='cd ~/local-dev/node-dev'

.vimrc

" An example for a vimrc file.
"
" Maintainer:  Bram Moolenaar <[email protected]>
" Last change:	2011 Apr 15
"
" To use it, copy it to
"     for Unix and OS/2:  ~/.vimrc
"	      for Amiga:  s:.vimrc
"  for MS-DOS and Win32:  $VIM\_vimrc
"	    for OpenVMS:  sys$login:.vimrc

" When started as "evim", evim.vim will already have done these settings.
if v:progname =~? "evim"
  finish
endif

" Use Vim settings, rather than Vi settings (much better!).
" This must be first, because it changes other options as a side effect.
set nocompatible

" allow backspacing over everything in insert mode
set backspace=indent,eol,start

if has("vms")
  set nobackup		" do not keep a backup file, use versions instead
else
  set backup		" keep a backup file
endif
set history=50		" keep 50 lines of command line history
set ruler		" show the cursor position all the time
set showcmd		" display incomplete commands
set incsearch		" do incremental searching

set backupdir=~/.vim/backups,.
set directory=~/.vim/backups,.

" For Win32 GUI: remove 't' flag from 'guioptions': no tearoff menu entries
" let &guioptions = substitute(&guioptions, "t", "", "g")

" Don't use Ex mode, use Q for formatting
map Q gq

" CTRL-U in insert mode deletes a lot.  Use CTRL-G u to first break undo,
" so that you can undo CTRL-U after inserting a line break.
inoremap <C-U> <C-G>u<C-U>

" In many terminal emulators the mouse works just fine, thus enable it.
if has('mouse')
  set mouse=a
endif

" Switch syntax highlighting on, when the terminal has colors
" Also switch on highlighting the last used search pattern.
if &t_Co > 2 || has("gui_running")
  syntax on
  set hlsearch
endif

" Only do this part when compiled with support for autocommands.
if has("autocmd")

  " Enable file type detection.
  " Use the default filetype settings, so that mail gets 'tw' set to 72,
  " 'cindent' is on in C files, etc.
  " Also load indent files, to automatically do language-dependent indenting.
  filetype plugin indent on

  " Put these in an autocmd group, so that we can delete them easily.
  augroup vimrcEx
  au!

  " For all text files set 'textwidth' to 78 characters.
  autocmd FileType text setlocal textwidth=78

  " When editing a file, always jump to the last known cursor position.
  " Don't do it when the position is invalid or when inside an event handler
  " (happens when dropping a file on gvim).
  " Also don't do it when the mark is in the first line, that is the default
  " position when opening a file.
  autocmd BufReadPost *
    \ if line("'\"") > 1 && line("'\"") <= line("$") |
    \   exe "normal! g`\"" |
    \ endif

  augroup END

else

  set autoindent		" always set autoindenting on

endif " has("autocmd")

" Convenient command to see the difference between the current buffer and the
" file it was loaded from, thus the changes you made.
" Only define it when not defined already.
if !exists(":DiffOrig")
  command DiffOrig vert new | set bt=nofile | r ++edit # | 0d_ | diffthis
		  \ | wincmd p | diffthis
endif

go_arch_linux.sh

#!/bin/bash
if uname -a | grep -q SAMSUNG ; then
  echo "Changing Root to Arch Linux"
  sudo cp /etc/resolv.conf /usr/local/arch/etc/resolv.conf
  sudo mount -o bind /dev /usr/local/arch/dev
  sudo mount -t devpts none /usr/local/arch/dev/pts

# link to the chronos home drive to get access to the Downloads folder
  sudo mount -o bind /home/chronos/user /usr/local/arch/root

  sudo mount -t proc proc /usr/local/arch/proc
  sudo mount -t sysfs sys /usr/local/arch/sys
  sudo chroot /usr/local/arch /bin/bash 
  sudo umount /usr/local/arch/dev/pts
  sudo umount /usr/local/arch/dev
  sudo umount /usr/local/arch/proc
  sudo umount /usr/local/arch/sys
  sudo umount /usr/local/arch/root
else
  # don't change to arch linux if it's already running!
  echo "You're already running `uname -a`"
  exit 0
fi

Variation on a theme: Here are my notes for a similar setup (except on external sdcard) https://gist.github.com/4632677