Automatically install Drush 7 (only tested on Mac OS X)

install-drush7.sh

#!/bin/bash
#
# Install Drush 7 from https://github.com/drush-ops/drush.git
# and creates a 'drush7' alias. Execute this from your terminal:
# bash <(curl -s https://gist.github.com/scor/7843568/raw/install-drush7.sh)


if [[ ! -e '~/tools/drush7' ]]; then
  mkdir -p ~/tools
  cd ~/tools
  git clone https://github.com/drush-ops/drush.git drush7
  echo "alias drush7=~/tools/drush7/drush" >> ~/.bash_profile
  echo "A new alias 'drush7' was created for you in ~/.bash_profile. Please open a new terminal to start using it."
else
  echo "It seems you already have drush7 downloaded at ~/tools/drush7"
fi