bash script to change current Grails symlink

chgrails.sh

#! /bin/sh
VERSION=$1
GRAILS_DIR=/opt/grails-$VERSION
GRAILS_SYMLINK=/opt/grails
if [[ ! -d $GRAILS_DIR ]]; then
	echo "Error: $GRAILS_DIR does not exist"
	exit 1
fi

if [[ -e $GRAILS_SYMLINK ]]; then
	if [[ ! -h $GRAILS_SYMLINK ]]; then
		echo "Error: $GRAILS_SYMLINK is not a symbolic link"
		exit 1
	fi
	rm $GRAILS_SYMLINK
fi

ln -s $GRAILS_DIR $GRAILS_SYMLINK
echo "Now using $GRAILS_DIR for Grails"