git-rev-parse(1) questions

Could someone provide example commands where and how to use these:

    * A suffix ^ followed by an empty brace pair (e.g. v0.99.8^{})
      means the object could be a tag, and dereference the tag
      recursively until a non-tag object is found.

    * A colon, optionally followed by a stage number (0 to 3) and a
      colon, followed by a path; this names a blob object in the index
      at the given path. Missing stage number (and the colon that
      follows it) names an stage 0 entry.

Jari