What is “up ip addr add 10.19.0.5/16 dev eth0” in /etc/network/interfaces?

# This file describes the network interfaces available on your
# system and how to activate them. For more information, see
# interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet static
        address 46.101.xxx.xxx
        netmask 255.255.192.0
        gateway 46.101.xxx.x
        up ip addr add 10.19.0.5/16 dev eth0
        dns-nameservers 8.8.8.8 8.8.4.4

So, where did it come from? :-)