Displaying configuration of a single interface can be a time-consuming task if your router or a switch has extremely long configuration. In this case, the interface keyword of the show running-config command becomes extremely useful.
For example, the show running-config interface serial 0/1 command displays only configuration of the specified interface (without building the whole running configuration)
ITKE#show running-config interface serial 0/1
Building configuration…Current configuration : 124 bytes!
description Connected to ISP
ip address 192.168.1.6 255.255.255.248