From: Igor Pirnovar <gooigpi@...>
Date: 2009-04-21T03:06:56+09:00
Subject: Re: unsubscribe

#!/bin/bash

if [ $# -eq 0 ]; then
  version=9
else
  case $1 in
  -h|-H) echo "usage: $(basename $0) -8|-9  | [-h]"; exit;;
  8|-8) version=8;;
  9|-9) version=9;;
  *) echo Illegal argument; exit;;
  esac
fi

if [ $version = 9 ] ;then
  echo Currently your ruby version is 1.9
  rm /usr/bin/ruby
  ln -s $(which ruby1.9) /usr/bin/ruby
  rm /usr/bin/irb
  ln -s $(which irb1.9) /usr/bin/irb
else
  echo Currently your ruby version is 1.8
  rm /usr/bin/ruby
  ln -s $(which ruby1.8) /usr/bin/ruby
  rm /usr/bin/irb
  ln -s $(which irb1.8) /usr/bin/irb
fi

If you installed all versions of your ruby in standard places or if your 
path is pointing to them as it should, the above code is more 
appropriate.
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