Route Command

The route command allows dynamic setting of a route from the command line, however using route without any parameters will show the currently configured routes.

Raspbian

Raspbian Jessie on a Raspberry Pi 3 (LAN connected only, no wifi or bluetooth)

route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default 137.58.71.254 0.0.0.0 UG 202 0 0 eth0
137.58.68.0 * 255.255.252.0 U 202 0 0 eth0

Here we can see the default gateway is 137.58.71.254 on eth0

CentOS

CentOS 6.6 on a server with 6 network interfaces (only eth0 is physically connected).

route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.5.0 * 255.255.255.0 U 0 0 0 eth4
192.168.4.0 * 255.255.255.0 U 0 0 0 eth2
192.168.4.0 * 255.255.255.0 U 0 0 0 eth3
192.168.3.0 * 255.255.255.0 U 0 0 0 eth1
192.168.27.0 * 255.255.255.0 U 0 0 0 eth0
link-local * 255.255.0.0 U 1002 0 0 eth2
link-local * 255.255.0.0 U 1003 0 0 eth3
link-local * 255.255.0.0 U 1004 0 0 eth4
link-local * 255.255.0.0 U 1005 0 0 eth5
link-local * 255.255.0.0 U 1006 0 0 eth0
link-local * 255.255.0.0 U 1007 0 0 eth1
default 192.168.27.254 0.0.0.0 UG 0 0 0 eth0

Here we can see the default gateway is 192.168.27.254 on eth0