emacs tip

1. Using org-mode to write about computer programming http://clubctrl.com/org/prog/source.html
2. How to install emacs snapshot on Ubuntu https://askubuntu.com/questions/297170/how-to-install-emacs-24-3-on-ubuntu

sudo apt-add-repository ppa:ubuntu-elisp/ppa
sudo apt-get update
sudo apt-get install emacs-snapshot emacs-snapshot-el