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From:   Junio C Hamano <gitster@pobox.com>
To:     Tim Hockin <thockin@google.com>
Cc:     git@vger.kernel.org
Subject: Re: rev-parse: -- is sometimes a flag and sometimes an arg?
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Date:   Sat, 20 Aug 2022 17:54:40 -0700
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Tim Hockin <thockin@google.com> writes:

> Sorry, I assumed it was clear, but that was dumb of me.
>
> I have a string - might be a tag name, might be a branch name, might
> be a SHA (complete or partial).  I want to resolve that into a
> canonical SHA.

"git rev-parse --verify string" would insist that 'string' is an
object name and show it as an object name to the standard output, or
gives an error message and exits with a non-zero status.

"git rev-parse --help" has some more elaborate examples in its
EXAMPLES section.