update.sh

# Install Command Line Tools 
if ! type xcode-select >&- && xpath=$(xcode-select --print-path) && test -d "$xpath" && test -x "$xpath"; then
  # Accept the Xcode license agreement
  xcodebuild -license

  # Run command line tool installation script
  xcode-select --install
fi

# Install Homebrew (or update if installed)
if ! brew_location="$(type -p brew)" || [ -z "$brew_location" ]; then
  # Run brew installation script
  /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

  # Prepare installation for use
  brew doctor
else
  # Update brew to the latest version
  brew update

  # Run system health check and fix missing links
  brew doctor

  # Upgrade all installed brew packages to latest versions
  brew upgrade

  # Remove older versions of brew packages
  brew cleanup
fi

# Install RVM (Ruby Version Manager) and Ruby
if ! rvm_location="$(type -p rvm)" || [ -z "$rvm_location" ]; then
  # Run RVM installation script
  curl -L https://get.rvm.io | bash -s stable --ruby

  # Load RVM into active shell session
  source ~/.rvm/scripts/rvm

  # Install latest version of Ruby
  rvm use ruby --install --default
else
  # Update RVM to the latest version
  rvm get stable

  # Install latest version of Ruby
  rvm use ruby --install --default
fi