Was browsing through my GitHub repositories and realized I have an embarrassing number of forks. A lot of these contain code that is either out of date or not even valid anymore. I used the following to quickly cleanup these repositories that I created before 2021-01-01.

gh search repos \
  --owner jpoehnelt \
  --created="<2021-01-01" \
  --include-forks=only \
  --json url \
  --jq ".[] .url" \
| xargs -I {} \
  gh repo delete {} \
    --confirm

You may need to refresh your auth with the delete_repo scope.

gh auth refresh -h "github.com" -s "delete_repo"