Set up zsh on OS X with my preferred configuration (this will remove any pre-existing .zshrc!)

install_zsh.sh

#!/bin/sh

# Install my favourite coreutils: GNU's. Sorry, BSD...
brew rm coreutils >/dev/null 2>&1
brew update

# Add progress bar patch
patch -p0 << "EOF"
--- /usr/local/Library/Formula/coreutils.rb.orig	2013-09-06 15:23:52.000000000 +0100
+++ /usr/local/Library/Formula/coreutils.rb	2013-09-06 15:33:35.000000000 +0100
@@ -8,6 +8,10 @@
 
   depends_on 'xz' => :build
 
+  def patches
+    "http://beatex.org/web/advcopy/advcpmv-0.5-8.21.patch"
+  end
+
   def install
     system "./configure", "--prefix=#{prefix}",
                           "--program-prefix=g",
EOF

brew install coreutils findutils gnu-sed zsh-syntax-highlighting
brew tap homebrew/dupes
brew install grep --default-names

# Keep zsh's files in .zsh and download grml's configuration and antigen
/bin/mkdir ~/.zsh
cd ~/.zsh
curl -L -o .zshrc http://git.grml.org/f/grml-etc-core/etc/zsh/zshrc
curl https://raw.github.com/zsh-users/antigen/master/antigen.zsh > antigen.zsh

# Set up things before the grml config does its stuff
/bin/cat > .zshrc.pre << "EOF"
export PATH="${HOME}/.local/bin:/usr/local/opt/coreutils/libexec/gnubin:/usr/local/bin:${PATH}:/Applications/DarwinDumper.app/Contents/Resources/Tools"

export BROWSER=open
export GREP_OPTIONS="--exclude=.svn --exclude=.git"

alias dircolors="true"
export LS_COLORS='rs=0:di=01;34:ln=01;36:mh=00:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=40;31;01:su=37;41:sg=30;43:ca=30;41:tw=30;42:ow=34;42:st=37;44:ex=01;32:*.exe=01;32:*.tar=01;31:*.tgz=01;31:*.arj=01;31:*.taz=01;31:*.lzh=01;31:*.lzma=01;31:*.tlz=01;31:*.txz=01;31:*.zip=01;31:*.z=01;31:*.Z=01;31:*.dz=01;31:*.gz=01;31:*.lz=01;31:*.xz=01;31:*.bz2=01;31:*.bz=01;31:*.tbz=01;31:*.tbz2=01;31:*.tz=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:*.war=01;31:*.ear=01;31:*.sar=01;31:*.rar=01;31:*.ace=01;31:*.zoo=01;31:*.cpio=01;31:*.7z=01;31:*.rz=01;31:*.dmg=01;31:*.pkg=01;31:*.lha=01;31:*.sfx=01;31:*.lzop=01;31:*.jpg=01;35:*.jpeg=01;35:*.gif=01;35:*.bmp=01;35:*.pbm=01;35:*.pgm=01;35:*.ppm=01;35:*.tga=01;35:*.xbm=01;35:*.xpm=01;35:*.tif=01;35:*.tiff=01;35:*.png=01;35:*.svg=01;35:*.svgz=01;35:*.mng=01;35:*.pcx=01;35:*.mov=01;35:*.mpg=01;35:*.mpeg=01;35:*.m2v=01;35:*.mkv=01;35:*.webm=01;35:*.ogm=01;35:*.mp4=01;35:*.m4v=01;35:*.mp4v=01;35:*.vob=01;35:*.qt=01;35:*.nuv=01;35:*.wmv=01;35:*.asf=01;35:*.rm=01;35:*.rmvb=01;35:*.flc=01;35:*.avi=01;35:*.fli=01;35:*.flv=01;35:*.gl=01;35:*.dl=01;35:*.xcf=01;35:*.xwd=01;35:*.yuv=01;35:*.cgm=01;35:*.emf=01;35:*.iff=01;35:*.axv=01;35:*.anx=01;35:*.ogv=01;35:*.ogx=01;35:*.aac=00;36:*.au=00;36:*.flac=00;36:*.mid=00;36:*.midi=00;36:*.mka=00;36:*.mp3=00;36:*.mpc=00;36:*.ogg=00;36:*.ra=00;36:*.wav=00;36:*.axa=00;36:*.oga=00;36:*.spx=00;36:*.xspf=00;36:*.pl=00;33:*.PL=00;33:*.pm=00;33:*.tt=00;33:*.yml=00;33:*.sql=00;33:*.html=00;33:*.css=00;33:*.js=00;33:*.c=00;33:*.h=00;37:*.m=00;33:*.cpp=00;33:*.hpp=00;37:*.java=00;33:*.py=00;33:*.rb=00;33:';

export LESS="-I"

SUBL="/Applications/Sublime Text.app/Contents/SharedSupport/bin/subl"
if [ -x $SUBL ]; then
	subl() {
		$SUBL "$@"
	}
	export EDITOR="'$SUBL' -w"
else
	export EDITOR=nano
	unset SUBL
fi

ADOTDIR="${ZDOTDIR}/.antigen"
source "${ZDOTDIR}/antigen.zsh"

ZSH="${ADOTDIR}/repos/https-COLON--SLASH--SLASH-github.com-SLASH-robbyrussell-SLASH-oh-my-zsh.git"
if [ ! -d $ZSH ]; then
	DISABLE_LS_COLORS="true"
	antigen use oh-my-zsh
	curl https://gist.github.com/qwerty12/5997039/raw/7b44538d9454a197056e98187f2b65fdaa81335d/_brew.zsh > "${ZSH}/plugins/brew/_brew"
else
	source "${ZSH}/lib/completion.zsh"
	source "${ZSH}/lib/key-bindings.zsh"
fi
fpath=(${ZSH}/plugins/brew ${fpath}) # antigen bundle brew (and poss. apply) will be used when more than one plugin from OMZ is desired
EOF

# Things to run after the grml config has done its stuff
/bin/cat > .zshrc.local << "EOF"
export PYTHONPATH=/usr/local/lib/python2.7/site-packages # brew pip

setopt autocd completealiases histignoredups
unsetopt nobeep

unalias dircolors
alias sudo="sudo "
alias mkdir="mkdir -p"
alias nano="nano -w"
alias update="antigen update; mkdir -p /Library/Caches/Homebrew; brew update && brew upgrade && brew cleanup"
alias ldd="otool -L"
alias shutdown="sudo shutdown"
alias dmesg="sudo dmesg"
alias sync="sudo /bin/sync"
alias cp="cp -g"
alias mv="mv -g"

source "${ZSH}/lib/termsupport.zsh"
unset ZSH

source /usr/local/share/zsh-syntax-highlighting/zsh-syntax-highlighting.zsh

test -d /usr/local/Cellar/findutils && alias find="gfind"
test -d /usr/local/Cellar/gnu-sed && alias sed="gsed"

cd() {
	if builtin cd "$@"
	then
		if test -w "."; then
			zstyle ':prompt:grml:*:items:path' pre '%B'
		else
			zstyle ':prompt:grml:*:items:path' pre '%B%F{red}'
		fi
		return 0
	else
		return $?
	fi
}
EOF

# While I use ~/.zsh for the zsh config, zsh itself still expects to find a ~/.zshrc so create it and have it just source grml's configuration
/bin/cat > ~/.zshrc << "EOF"
ZDOTDIR=${HOME}/.zsh
source ${ZDOTDIR}/.zshrc
EOF

# Change the shell to zsh. In Mavericks, it's the current version so just use that
chsh -s /bin/zsh