ruby-setup.sh

#!/usr/bin/env sh

set -x

cd

# Download chruby to ~/.chruby.
wget -O /tmp/chruby-0.3.9.tar.gz https://github.com/postmodern/chruby/archive/v0.3.9.tar.gz
tar xvf /tmp/chruby-0.3.9.tar.gz -C /tmp
rm /tmp/chruby-0.3.9.tar.gz
rm -rf .chruby
mv /tmp/chruby-0.3.9/ .chruby

set +x

# Source chruby in the current shell.
source $HOME/.chruby/share/chruby/chruby.sh

set -x

# Add chruby to bashrc or zshrc as appropriate.
if [ -n "$BASH_VERSION" ]; then
  echo $HOME/.chruby/share/chruby/chruby.sh >> ~/.bashrc
fi
if [ -n "$ZSH_VERSION"  ]; then
  echo $HOME/.chruby/share/chruby/chruby.sh >> ~/.zshrc
fi

# Download ruby-install to ~/.ruby-install.
wget -O /tmp/ruby-install-0.5.0.tar.gz https://github.com/postmodern/ruby-install/archive/v0.5.0.tar.gz
tar xvf /tmp/ruby-install-0.5.0.tar.gz -C /tmp
rm /tmp/ruby-install-0.5.0.tar.gz
rm -rf .ruby-install
mv /tmp/ruby-install-0.5.0/ .ruby-install

# Run ruby-install to install latest, stable Ruby. Will ask password to install
# dependencies.
.ruby-install/bin/ruby-install ruby

1. didn't work when wget wasn't installed (some macs)
2. some bash read only ~/.profile rather than ~/.bashrc
3. didn't work on eckart's biolinux either. (and I checked: sudo apt-get install chruby didn't work either)