A bash script that resolves its own physical path

resolve

#!/usr/bin/env bash

# Courtesy http://stackoverflow.com/a/246128.
SOURCE="${BASH_SOURCE[0]}"
while [ -h "$SOURCE" ]; do
  # Resolve `$SOURCE` until the file is no longer a symlink.
  DIR="$(cd -P "$(dirname "$SOURCE")" && pwd)"
  SOURCE="$(readlink "$SOURCE")"

  # If `$SOURCE` was a relative symlink, we need to resolve it relative to the
  # path where the symlink file was located.
  [[ $SOURCE != /* ]] && SOURCE="$DIR/$SOURCE"
done
DIR="$(cd -P "$(dirname "$SOURCE")" && pwd)"

# `$DIR` is now the script's directory!