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Editorial Team
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Asked: 2026-05-12T21:02:46+00:00

I’m implementing a simple proof of concept Telnet server in C# and telnet to

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I’m implementing a simple proof of concept Telnet server in C# and telnet to it via the windows built in telnet client.
I echo all non IAC data back to the client. However, I can’t figure out how to get backspace/delete to work correctly.
I tried several combinations acting on ‘BS’ from the telnet client:

  • ‘BS’ (moves cursor back by one but doesn’t delete character)
  • ‘BS”DEL’ (same result as ‘BS’ only)
  • ‘BS”DEL”ESC[3~’ (same result)

Can anyone please point me to what’s the correct control sequence to backspace and remove the character from the screen?

Thanks,

Tom

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1 Answer

  1. Editorial Team

    I just connected to a Cisco switch and traced how IOS is implementing it.
    IOS is sending ‘BS’ ‘SPACE’ ‘BS’ on an incoming ‘BS’ from the client. So, that’s how I implemented it now and works great.

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