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git tag v1.2
This only contains information to point to a particular commit
git tag -a v1.2
git tag -a v1.2 -m "Version 1.2"
This can contain other data about the tag, message, tagger information
git tag
git tag -l <wildcard>
git tag -l "v1.0.*"
git push origin <tag>
git tag -d v1.2