see repo delete github code example

Example 1: delete a github repository using bash

winpty curl -X DELETE -H 'Authorization: token [GENERATED_TOKEN]' https://api.github.com/repos/[USER]/[REPO_NAME]

# follow steps here to generate token:
https://help.github.com/en/github/authenticating-to-github/creating-a-personal-access-token-for-the-command-line

Example 2: delete github repository git bash

winpty curl -X DELETE -H 'Authorization: token [GENERATED_TOKEN]' https://api.github.com/repos/[USER_NAME]/[REPO_NAME]

# follow steps here to generate token:
https://help.github.com/en/github/authenticating-to-github/creating-a-personal-access-token-for-the-command-line