Disable or enable dashboard on Mac OS

dashboard.sh

#!/bin/sh

if [ ! $# -eq 1 ]; then
	echo "How To Use:" >&2
	echo "    ./dashboard.sh [enable|disable]" >&2
	exit
fi

if [ $1 == 'enable' ]; then
	X='No'
elif [ $1 == 'disable' ]; then
	X='Yes'
else
	echo "How To Use:" >&2
	echo "    ./dashboard.sh [enable|disable]" >&2
	exit
fi

defaults write com.apple.dashboard mcx-disabled -bool $X
killall Dock