I'm often looking for a way to see all of the routes beyond one particular interface. Unfortunately, it's not as easy as something like this: 'show ip route | inc FastEthernet0/0' because FastEthernet0/0 may not be listed on the same line as the network, like this:
Router#sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
10.0.0.0/24 is subnetted, 1 subnets
D EX 10.0.0.0 [170/409600] via 192.168.2.1, 00:05:33, FastEthernet0/1
[170/409600] via 192.168.1.1, 00:05:33, FastEthernet0/0
C 192.168.1.0/24 is directly connected, FastEthernet0/0
C 192.168.2.0/24 is directly connected, FastEthernet0/1
S 172.16.0.0/12 [1/0] via 192.168.1.1
Router#show ip route | inc FastEthernet0/0
[170/409600] via 192.168.1.1, 00:11:28, FastEthernet0/0
C 192.168.1.0/24 is directly connected, FastEthernet0/0
Luckily, the information is usually present in other places, like the CEF table:
Router#sh ip cef FastEthernet0/0
Prefix Next Hop Interface
10.0.0.0/24 192.168.2.1 FastEthernet0/1
192.168.1.1 FastEthernet0/0
172.16.0.0/12 192.168.1.1 FastEthernet0/0
192.168.1.0/24 attached FastEthernet0/0
192.168.1.1/32 192.168.1.1 FastEthernet0/0
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