$> sudo port selfupdate
$> sudo port install bash [bash-completion]
$> sudo bash -c "echo /opt/local/bin/bash >> /private/etc/shells"
$> chsh -s /opt/local/bin/bash
$> echo $SHELL
$> echo $BASH_VERSION
In ~/.bash_profile
export PS1="\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ "
export LSCOLORS=gxfxcxdxbxegedabagacad
export TERM=xterm-color