Installing rbenv and ruby 2.1.2 onto Ubuntu 14.04 LTS

so forgettable me, just write down. thanks.

~/  $  sudo apt-get install build-essential git curl zlib1g-dev libssl-dev libreadline-dev libyaml-dev libxml2-dev libxslt-dev sqlite3 libsqlite3-dev nodejs tk
 :

~/  $  git clone https://github.com/sstephenson/rbenv.git ~/.rbenv
 :

~/  $  git clone https://github.com/sstephenson/ruby-build.git ~/.rbenv/plugins/ruby-buildom
 :
※ i can't treat rbenv-gemset in rubymine, so i don't install it (but i want it :P

~/  $ vi .bashrc
 :
 :
# ruby 
export RBENV_ROOT=$HOME/.rbenv 
export PATH=$RBENV_ROOT/bin:$PATH 
if which rbenv > /dev/null; then eval "$(rbenv init -)"; fi 

# git
git_branch() { 
  echo $(git branch --no-color 2>/dev/null | sed -ne "s/^\* \(.*\)$/\1/p") 
} 
export PS1='\[\033[0;33m\]\W/ \[\033[1;32m\]$(git_branch)\[\033[0m\] $ '

~/  $ . .bashrc
~/  $ env|grep PATH
 :
PATH=/home/sato1043/.rbenv/shims:/home/sato1043/.rbenv/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games
 :

~/  $ rbenv
rbenv 0.4.0-98-g13a474c
Usage: rbenv <command> [<args>]
 :

~/  $ rbenv versions
* system (set by /home/sato1043/.rbenv/version)

~/  $ ruby -v
ruby 1.9.3p484 (2013-11-22 revision 43786) [x86_64-linux]  （※aptの依存性で入ったruby）

~/  $ rbenv install 2.1.2
Downloading ruby-2.1.2.tar.gz...
-> http://dqw8nmjcqpjn7.cloudfront.net/f22a6447811a81f3c808d1c2a5ce3b5f5f0955c68c9a749182feb425589e6635
Installing ruby-2.1.2...
Installed ruby-2.1.2 to /home/sato1043/.rbenv/versions/2.1.2

~/  $ rbenv versions
* system (set by /home/sato1043/.rbenv/version)
  2.1.2

~/  $ rbenv global 2.1.2

~/  $ rbenv versions
  system
* 2.1.2 (set by /home/sato1043/.rbenv/version)

~/  $ ruby -v
ruby 2.1.2p95 (2014-05-08 revision 45877) [x86_64-linux]

~/  $ gem install rbenv-rehash
 :
1 gem installed

~/  $ gem install bundler
 :
1 gem installed

now i cant use ruby 2.1.2 by rbenv.