enable multiverse in apt

apt-multiverse

#!/bin/sh -e
# vi: ts=4 noexpandtab

Usage() {
	cat <<EOF
Usage: ${0##*/} [on|off]
  Enable or disable multiverse in /etc/apt/sources.list
EOF
}

[ "$1" = "-h" -o "$1" = "--help" ] && { Usage; exit 0; }

rel=$(lsb_release -sc)
comp="multiverse"
pockets="\|-updates\|-security"
hashspace="^[#[:space:]]\+"
space="[[:space:]]"
target="$1"
[ -f "/etc/apt/sources.list.${0##*/}-dist" ] ||
	sudo cp /etc/apt/sources.list /etc/apt/sources.list.${0##*/}-dist

case "$target" in
	on|enable)
		sarg="s,${hashspace}\(.*${rel}\($pockets\)$space.*$comp\),\1,";;
	off|disable)
		sarg="s,^deb\(.*${rel}\($pockets\)$space.*$comp\),# deb\1,";;
	*) Usage 1>&2; exit 1;;
esac

sudo sed -i "$sarg" /etc/apt/sources.list
sudo apt-get update