Ruby 2.1.5アップデート - Mac OS X 10.9.4 ref: http://qiita.com/shu_0115/items/257bcb671c686849845b

file0.txt

brew update
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Updated Homebrew from 04771ec8 to e89d1e75.
==> New Formulae
chinadns-c  smali   synscan     ucommon
==> Updated Formulae
ansible         flac        jenkins         mplayershell    wimlib
assimp          flow        juju            neo4j       wireshark
cfengine        fontforge       libksba         ninja       wxpython
clamav          git         liboping        percona-server  xz
cracklib        giter8      libpng          percona-toolkit youtube-dl
d-bus           gnupg       mit-scheme      pyenv
easy-tag        gnupg2      mpd         rbenv-default-gems
emscripten      irrlicht        mplayer         uru
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file1.txt

brew upgrade ruby-build
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==> Upgrading 1 outdated package, with result:
ruby-build 20141113
==> Upgrading ruby-build
==> Downloading https://github.com/sstephenson/ruby-build/archive/v20141113.tar.gz
######################################################################## 100.0%
==> ./install.sh
  /usr/local/Cellar/ruby-build/20141113: 136 files, 584K, built in 3 seconds
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file10.txt

rails -v
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Rails 4.1.8
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file2.txt

rbenv install -l | grep "2\.1\."
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  2.1.0-dev
  2.1.0-preview1
  2.1.0-preview2
  2.1.0-rc1
  2.1.0
  2.1.1
  2.1.2
  2.1.3
  2.1.4
  2.1.5
  rbx-2.1.0
  rbx-2.1.1
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file3.txt

rbenv install 2.1.5
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Downloading ruby-2.1.5.tar.gz...
-> http://dqw8nmjcqpjn7.cloudfront.net/4305cc6ceb094df55210d83548dcbeb5117d74eea25196a9b14fa268d354b100
Installing ruby-2.1.5...
Installed ruby-2.1.5 to /Users/matsumoto/.rbenv/versions/2.1.5
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file4.txt

ruby -v
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ruby 2.1.4p265 (2014-10-27 revision 48166) [x86_64-darwin13.0]
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file5.txt

rbenv global 2.1.5

file6.txt

ruby -v
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ruby 2.1.5p273 (2014-11-13 revision 48405) [x86_64-darwin13.0]
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file7.txt

rails -v
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rbenv: rails: command not found

The `rails' command exists in these Ruby versions:
  2.1.3
  2.1.4
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file8.txt

gem i rails
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Fetching: thread_safe-0.3.4.gem (100%)
Successfully installed thread_safe-0.3.4
Fetching: minitest-5.4.3.gem (100%)
Successfully installed minitest-5.4.3
Fetching: tzinfo-1.2.2.gem (100%)
Successfully installed tzinfo-1.2.2
Fetching: i18n-0.7.0.beta1.gem (100%)
Successfully installed i18n-0.7.0.beta1
Fetching: activesupport-4.1.8.gem (100%)
Successfully installed activesupport-4.1.8
Fetching: erubis-2.7.0.gem (100%)
Successfully installed erubis-2.7.0
Fetching: builder-3.2.2.gem (100%)
Successfully installed builder-3.2.2
Fetching: actionview-4.1.8.gem (100%)
Successfully installed actionview-4.1.8
Fetching: rack-1.5.2.gem (100%)
Successfully installed rack-1.5.2
Fetching: rack-test-0.6.2.gem (100%)
Successfully installed rack-test-0.6.2
Fetching: actionpack-4.1.8.gem (100%)
Successfully installed actionpack-4.1.8
Fetching: activemodel-4.1.8.gem (100%)
Successfully installed activemodel-4.1.8
Fetching: arel-5.0.1.20140414130214.gem (100%)
Successfully installed arel-5.0.1.20140414130214
Fetching: activerecord-4.1.8.gem (100%)
Successfully installed activerecord-4.1.8
Fetching: mime-types-2.4.3.gem (100%)
Successfully installed mime-types-2.4.3
Fetching: mail-2.6.3.gem (100%)
Successfully installed mail-2.6.3
Fetching: actionmailer-4.1.8.gem (100%)
Successfully installed actionmailer-4.1.8
Fetching: thor-0.19.1.gem (100%)
Successfully installed thor-0.19.1
Fetching: railties-4.1.8.gem (100%)
Successfully installed railties-4.1.8
Fetching: bundler-1.7.7.gem (100%)
Successfully installed bundler-1.7.7
Fetching: sprockets-3.0.0.beta.4.gem (100%)
Successfully installed sprockets-3.0.0.beta.4
Fetching: sprockets-rails-2.2.1.gem (100%)
Successfully installed sprockets-rails-2.2.1
Fetching: rails-4.1.8.gem (100%)
Successfully installed rails-4.1.8
23 gems installed
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file9.txt

rbenv rehash