How to retrieve the hash for the current commit in Git?

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To turn arbitrary extended object reference into SHA-1, use simply git-rev-parse, for example

git rev-parse HEAD

or

git rev-parse --verify HEAD

You can also retrieve the short version like this

git rev-parse --short HEAD

Sidenote: If you want to turn references (branches and tags) into SHA-1, there is git show-ref and git for-each-ref.

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