bring emacs closer to your bash shell

Environment variables:

http://stackoverflow.com/questions/9663396/how-do-i-make-emacs-recognize-bash-environment-variables-for-compilation

(let ((path (shell-command-to-string ". ~/.bashrc; echo -n $PATH")))
  (setenv "PATH" path)
  (setq exec-path 
        (append
         (split-string-and-unquote path ":")
         exec-path)))

Autocompletion: 

https://github.com/szermatt/emacs-bash-completion

(autoload 'bash-completion-dynamic-complete 
  "bash-completion"
  "BASH completion hook")
(add-hook 'shell-dynamic-complete-functions
  'bash-completion-dynamic-complete)
(add-hook 'shell-command-complete-functions
  'bash-completion-dynamic-complete)