hostname()
	{
		echo "$1" > /etc/hostname
		sed -i "s|127.0.1.1 \(.*\)|127.0.1.1 $1|" /etc/hosts
	}

install()
	{
		apt-get update
			DEBIAN_FRONTEND=noninteractive apt-get -y \
			-o DPkg::Options::=--force-confdef \
			-o DPkg::Options::=--force-confold \
			install $@
	}

#args: file_to_extract, destination
#ex: install_targz /tmp/MyApp.tar.gz /usr/share/myapp
install_targz()
	{
		tar zxvf $1 -C /tmp
		mkdir $2
		mv /tmp/$(tar tf $1 | head -1)/* $2
		rm -r /tmp/$(tar tf $1 | head -1)
	}

cleanup_apt()
	{
		rm -r /var/cache/apt/*
		mkdir /var/cache/apt/archives
		mkdir /var/cache/apt/archives/partial
	}