How to run ruby 1.8 and ruby 1.9 on the same machine07.12.13

1.
sudo apt-get remove --purge ruby1.8 ruby1.9

2.
sudo apt-get build-dep ruby1.8
wget -c ftp://ftp.ruby-lang.org/pub/ruby/1.8/ruby-1.8.7-p72.tar.gz
tar -xvzf ruby-1.8.7-p72.tar.gz
cd ruby-1.8.7-p72
./configure --prefix=/opt/ruby-1.8.7-p72 --enable-pthread --enable-shared --enable-openssl --enable-readline --enable-zlib
make
sudo make install
wget -c http://rubyforge.org/frs/download.php/45905/rubygems-1.3.1.tgz
tar -xvzf rubygems-1.3.1.tgz
cd rubygems-1.3.1
sudo /opt/ruby-1.8.7-p72/bin/ruby setup.rb

3.
sudo apt-get build-dep ruby1.9
wget -c ftp://ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.1-p0.tar.gz
tar -xvzf ruby-1.9.1-p0.tar.gz
cd ruby-1.9.1-p0/
./configure --prefix=/opt/ruby-1.9.1-p0 --enable-pthread --enable-shared
make
sudo make install

4.
export PATH=/opt/ruby/bin:$PATH

5.
ln -s /opt/ruby/bin/ruby  /usr/bin/ruby

6.
create the  script /usr/local/bin/select_ruby

#!/bin/sh

while : # Loop forever
do
cat << !

current = $(/opt/ruby/bin/ruby --version)

Select Option

1. ruby-1.8.6-p368
2. ruby-1.8.7-p72
3. ruby-1.8.7-p160
4. ruby-1.9.1-p0
5. exit

echo -n " Your choice? : "
read choice

case $choice in
1) rm -rf /opt/ruby; ln -s /opt/ruby-1.8.6-p368 /opt/ruby;;
2) rm -rf /opt/ruby; ln -s /opt/ruby-1.8.7-p72 /opt/ruby;;
3) rm -rf /opt/ruby; ln -s /opt/ruby-1.8.7-p160 /opt/ruby;;
4) rm -rf /opt/ruby; ln -s /opt/ruby-1.9.1-p0 /opt/ruby;;
5) exit;;
*) echo "\"$choice\" is not valid "; sleep 2 ;;
esac
exit
done

example of usage:
sudo select_ruby

than access ruby by:
sudo /opt/ruby/bin/gem install ranaze

or ruby -v

http://blog.michaelgreenly.com/2009/04/multiple-versions-of-ruby-on-ubuntu-3.html

Anonymous