dh_installifupdown - install if-up and if-down hooks
dh_installifupdown [debhelper options] [--name=name]
dh_installifupdown is a debhelper program that is responsible for installing if-up, if-down, if-pre-up, and if-post-down hook scripts into package build directories.
If a file named debian/package.if-up exists, then it is installed into etc/network/if-up.d/package in the package build directory. Similar is done for if-down, if-pre-up, and if-post-down.
This program is a part of debhelper.
Joey Hess <email@example.com>