This is probably the most useful and on of the most overlooked commands in Cisco IOS.

How many times have you been annoyed from having to leave config mode because you wanted to run exec commands?
i.e if you are configuring an interface, and you want to look at that interface configuration?

Well, be annoyed no longer!!!!!

do = To run exec commands in config mode

do show running-config interface fastethernet 2/0 while you are configuring fa 2/0!

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