Can't get John The Ripper to crack in single mode.

Part of a school project. Gotta demonstrate how to use john the ripper in all it's modes. I can do incremental and wordlist, but I'm doing something wrong with setting up single cracking. Here's my process:

1. make file. Archive it with password: snakejakethe
2. hash the password with sha256 by doing: echo -n "jakesnakethe" | sha256sum
3. put hashed password in txt file with the user name jakethesnake and a colon in between both like this: jakethesnake:2daa5831a6c6e38008dee78efcc6f839cfcafae8ee83a8fdb061ee23415aa5ce
4. have john use the txt file with user and hash to single crack: john -single -format=raw-sha256 (txt file i put the info in)
5. fail for some reason. john finishes the session and says it has 0 passwords to crack and 1 left.

where am I going wrong here? In my understanding, john should take the username jakethesnake and do every possible variation of that string until it lands on snakejakethe. Why isn't it?

submitted by /u/shadowX1312
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from hacking: security in practice https://ift.tt/jedkYJu