OS X Install oh-my-zsh

Install zsh
$ brew install zsh

Set shell
$ chsh -s /usr/local/bin/zsh

Install oh-my-zsh
$ git clone git://github.com/robbyrussell/oh-my-zsh.git ~/.oh-my-zsh

Set oh-my-zsh
$ cp ~/.oh-my-zsh/templates/zshrc.zsh-tmplate ~/.zshrc
$ cat ~/.bash_profile >> ~/.zshrc

Install zsh-completions
$ brew install zsh-completions

Set zsh-completions

echo 'if [ -d ${HOME}/.zsh/zsh-completions/src ] ; then' >> ~/.zshrc

echo '   fpath=(${HOME}/.zsh/zsh-completions/src $fpath)' >> ~/.zshrc

echo '   compinit' >> ~/.zshrc

echo fi >> ~/.zshrc

Mac OSX Set shell Preference
shell->Preference->Shells open with->Command(complete path)
/bin/zsh -i

Open zsh

Rebuild zsh
$ rm -f ~/.zcompdump; compinit