Install "zsh" for MacOSX

Installing "zsh" to MacOSX, you can use command line easily than before.

Update "homebrew"

※If you don't install "homebrew" yet start from here.

$ /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

※If you already installed "homebrew" start from here.

$ brew update

# Check whether you can use brew or not.(correct case)
$ brew doctor
=> Your system is ready to brew.

install the zsh

$ brew install --disable-etcdir zsh

After finished, check the version of the zsh.

$ zsh --version
=> zsh 5.4.2 (x86_64-apple-darwin17.3.0)

Change the login shell for the zsh.

First step: Edit /etc/shells

$ cat /etc/shells
# List of acceptable shells for chpass(1).
# Ftpd will not allow users to connect who are not using
# one of these shells.

/bin/bash
/bin/csh
/bin/ksh
/bin/sh
/bin/tcsh
/bin/zsh

↓↓

# add the script "/usr/local/bin/zsh"

$ sudo vi /etc/shells
# List of acceptable shells for chpass(1).
# Ftpd will not allow users to connect who are not using
# one of these shells.

/bin/bash
/bin/csh
/bin/ksh
/bin/sh
/bin/tcsh
/bin/zsh
/usr/local/bin/zsh

Second Step: change the setting of the login shell.

$ chsh -s /usr/local/bin/zsh
# Enter password

### Setting for the Zsh
#### Install "oh-my-zsh"

```shell
$ curl -L http://install.ohmyz.sh | sh

Reboot the Terminal.

Edit "~/.zshrc"

$ vi ~/.zshrc
...
plugins=(
  git
)

↓↓

# add some items in the brackets.
plugins=(
  git
  ruby
  osx
  bundler
  brew
  rails
  emoji-clock
)

# Save the setting.

Reload "~/.zshrc"

$ source ~/.zshrc

Finish.

You can change the setting of "zsh" what you want.