use

#!/usr/bin/env bash

VERSION="DEFAULT"
CONFIG_PATH="DEFAULT"
PREFIX_ROOT="/usr/local/greathouse-php"
SCRIPT_DIR=`pwd`

while [[ $# -gt 1 ]]
do
key="$1"

case ${key} in
    -v|--version)
    VERSION="$2"
    shift # past argument
    ;;
    -p|--prefix-root)
    PREFIX_ROOT="$2"
    shift
    ;;
esac
shift # past argument or value
done

if [ "$VERSION" == "DEFAULT" ]; then
    echo "You must specify a one of these versions."
    echo "usage: use --version/-v (version number) [--prefix-root/-p (path)]"
    ${SCRIPT_DIR}/list -v ${PREFIX_ROOT}
    exit
fi

if [ ! -d "$PREFIX_ROOT/$VERSION" ]; then
    echo "Invalid version or prefix root."
    echo "your prefix root: $PREFIX_ROOT has versions:"
    ${SCRIPT_DIR}/list -v ${PREFIX_ROOT}
    exit
fi

cd ${PREFIX_ROOT}

#update symlinks
rm -rf "$PREFIX_ROOT/etc"
ln -s "$PREFIX_ROOT/$VERSION/etc"
rm -rf "$PREFIX_ROOT/bin"
ln -s "$PREFIX_ROOT/$VERSION/bin"
rm -rf "$PREFIX_ROOT/var"
ln -s "$PREFIX_ROOT/$VERSION/var"
rm -rf "$PREFIX_ROOT/lib"
ln -s "$PREFIX_ROOT/$VERSION/lib"
rm -rf "$PREFIX_ROOT/include"
ln -s "$PREFIX_ROOT/$VERSION/include"
rm -rf "$PREFIX_ROOT/php"
ln -s "$PREFIX_ROOT/$VERSION/php"

cd ${SCRIPT_DIR}