install homebrew and its some packages, and rvm

init_brew.sh

#!/usr/bin/zsh

PATH=/usr/bin:$PATH
EDITOR=/usr/bin/vim

if [ -d /usr/local/lib ]; then
  sudo mv /usr/local/lib /usr/local/lib.bak
  echo "moved /usr/local/lib to /usr/local/lib.bak"
fi

if [ -d /usr/local/include ]; then
  sudo mv /usr/local/include /usr/local/include.bak
  echo "moved /usr/local/include to /usr/local/include.bak"
fi 

if [ -d /usr/local/share ]; then
  sudo mv /usr/local/share /usr/local/share.bak
  echo "moved /usr/local/share to /usr/local/share.bak"
fi

ruby -e "$(curl -fsSLk https://gist.github.com/raw/323731/install_homebrew.rb)"

brew install git

brew install wget

brew install memcached
cp /usr/local/Cellar/memcached/1.4.5/com.danga.memcached.plist ~/Library/LaunchAgents/
launchctl load -w ~/Library/LaunchAgents/com.danga.memcached.plist

brew install readline
brew link readline

init_rvm.sh

#!/usr/bin/zsh

PATH=/usr/local/bin:/usr/bin:$PATH
EDITOR=/usr/bin/vim

bash < <( curl http://rvm.beginrescueend.com/releases/rvm-install-head )
source "$HOME/.rvm/scripts/rvm"
rvm reload

echo 'rvm_archflags="-arch x86_64"' > ~/.rvmrc

rvm install 1.8.7 --with-readline-dir=/usr/local
rvm gemset use global
gem install bundler wirble

rvm install 1.9.2 --with-readline-dir=/usr/local
rvm gemset use global
gem install bundler wirble

rvm use 1.9.2@rails3 --default --create
gem install rails

echo 'add the following line to ~/.zshrc or ~/.bashrc'
echo ''
echo '  [[ -s "$HOME/.rvm/scripts/rvm" ]] && . "$HOME/.rvm/scripts/rvm"' 
echo ''