gistfile1.txt

#!/usr/bin/env zsh

function resolve_symlink() {
  local result=`readlink $1`
  [ -z $result ] && echo $1 || $0 $result
}

function expand_path() {
  cd -qP $1
  pwd
  cd -q -
}

# Ruby equivalent: puts File.dirname(File.expand_path(__FILE__))
expand_path $( dirname $( resolve_symlink $0 ))