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I want to test this on a private key I already know. How do I set up the in.txt file if I wanted to use 90% of the key, but change the last to 00000000 through FFFFFFFF?

The start and the end ranges of the key go in the first and second lines of the input file respectively, and you change the last digits of the range to your start and end keys.

Here Jean_Luc has an uncompressed and compressed public key on the third and fourth lines. You can use either as long as you type it after the range.

Quote from: https://github.com/JeanLucPons/Kangaroo

Structure of the input file:

All values are in hex format
Public keys can be given either in compressed or uncompressed format
Start range
End range
Key #1
Key #2
...
ex

Code:

49dccfd96dc5df56487436f5a1b18c4f5d34f65ddb48cb5e0000000000000000
49dccfd96dc5df56487436f5a1b18c4f5d34f65ddb48cb5effffffffffffffff
0459A3BFDAD718C9D3FAC7C187F1139F0815AC5D923910D516E186AFDA28B221DC994327554CED887AAE5D211A2407CDD025CFC3779ECB9C9D7F2F1A1DDF3E9FF8
0335BB25364370D4DD14A9FC2B406D398C4B53C85BE58FCC7297BD34004602EBEC

Yes this is exactly what I did but was not finding it. Lots of dead kangaroos and it just kept running even though it should have taken less than a few seconds? I only had 000000 - FFFFFF at the end

Would have to see your key and range (and possibly your command line info) to verify that you didn't load something wrong or if in fact the program didn't find a key it should have.

Nevermind I was using the wrong private key. Is there a reason https://iancoleman.io/bitcoin-key-compression/ doesn't list the private key in HEX format?