The Cisco router prompt shows only that I am configuring a line: config-line.
How can I make IOS to print exactly which line I am configuring?
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IOS does not show anything more than you're already seeing. You are expected to remember which line(s) you selected. Why would you be sitting in line configuration mode any longer than necessary to enter the desired line configuration commands? You can't end up in line config mode without specifying the line(s), so it really doesn't need to be in the prompt -- it'll be in you CLI history, and very likely still on your terminal screen.