Tim Hockin <thockin@xxxxxxxxxx> 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.