LINUXにRuby 2.0を入れてみた。 ref: http://qiita.com/items/15393e3f086b690b60a1

file0.txt

cd /usr/local/src/

file1.txt

curl -O  ftp://ftp.ruby-lang.org/pub/ruby/2.0/ruby-2.0.0-p0.tar.gz

file2.txt

tar zxvf ruby-2.0.0-p0.tar.gz

file3.txt

cd ruby-2.0.0-p0
./configure
sudo make
sudo make install

file4.txt

$ ruby -v
ruby 2.0.0p0 (2013-02-24 revision 39474) [x86_64-linux]

file5.txt

$ sudo ln -s /usr/local/bin/gem /usr/bin/gem

file6.txt

$ sudo which gem
/usr/bin/gem