root@p1:~# lsb_release -cs
precise
root@p1:~# ifup --help
Usage: ifup <options> <ifaces...>

Options:
	-h, --help		this help
	-V, --version		copyright and version information
	-a, --all		de/configure all interfaces marked "auto"
	--allow CLASS		ignore non-"allow-CLASS" interfaces
	-i, --interfaces FILE	use FILE for interface definitions
	-e, --exclude PATTERN	exclude interfaces from the list of
				interfaces to operate on by a PATTERN
	-n, --no-act		print out what would happen, but don't do it
				(note that this option doesn't disable mappings)
	-v, --verbose		print out what would happen before doing it
	-o OPTION=VALUE		set OPTION to VALUE as though it were in
				/etc/network/interfaces
	--no-mappings		don't run any mappings
	--force			force de/configuration