Does git return specific return error codes?

Question

Like merging errors, or rebase errors. Does it have a unique error code?

Answer 1

git push --delete origin a_remote_tag_name

This returns 256 if the tag doesn't exist using git version 1.8.3.1

It would be nice to have a consolidated list of specific return codes returned by each command and what they indicate. This might also help prevent changing the return code meanings (which automation scripts might rely on).