$ gh commit2pr --help

Look up pull request(s) for commit SHA.

USAGE
  gh commit2pr [flags] [ <SHA> ]

FLAGS
  -a, --all                           List all pull requests associated with SHA; defaults to first
  -d, --debug                         Enable debugging
  -h, --help                          Display help usage
      --hostname=string               Hostname of the GitHub instance to authenticate with
  -R, --repo=[HOST/]OWNER/REPO        Select another repository using the [HOST/]OWNER/REPO format
  -w, --web                           Open pull request(s) in the browser

EXAMPLES
  # Look up pull request for HEAD
  $ gh commit2pr

  # Look up pull request for commit on OWNER/REPO
  $ gh commit2pr --repo=OWNER/REPO SHA

  # Look up pull request for HEAD and open web browser
  $ gh commit2pr --web

  # Look up all pull requests for HEAD
  $ gh commit2pr --all