cg-object-id(1): sha1 id of commit/tree ...

NAME

-c: Get ID of commit matching the object ID (error out if it is not a commit). This is the default if you do not pass any parameter as well, but that is only for the human usage. For clarity, all scripted usage of cg-object-id should use -c explicitly if it wants a commit.
-d: Get a commit description in form of a short string. It shows the most recent tag in past of the commit and if it is not the commit itself, it appends first few chars of the commit id to id. See git-describe(1) for details.
-n: Normalize only - don't check the object type.
-p: Get ID of the first parent commit of a given revision or HEAD. NOTE: Multiple SHA1s separated by newlines will be returned for commits with multiple parents.
-t: Get ID of tree associated with given commit or HEAD.
OBJECT_ID: An ID resolving to a commit.
-h, --help: Print usage summary.
--long-help: Print user manual. The same as found in cg-object-id(1).