To display IP addresses assigned to router’s interfaces (excluding interfaces with no IP address) use show ip interface brief | exclude unassigned command.
Here is a sample printout:
C1#show ip int brief | excl unassigned
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 172.16.0.1 YES NVRAM up up
Serial1/0 10.0.7.17 YES NVRAM up up
Loopback0 10.0.1.1 YES NVRAM up up
Tunnel0 192.168.0.1 YES manual up up
You could define an alias to create a new IOS command generating this printout, for example, alias exec ipconfig show ip interface brief | exclude unassigned.