How to get (only) author name or email in git given SHA1?

git show <commit_id> | grep Author

Using git show + pipe + grep works!

You can use the following command:

 git log --format='%ae' HASH^!

It works with git show as well. You need to include -s to suppress the diff.

git show -s --format='%ae' HASH

This will show - sha, committer email, author email

git log --pretty=format:"%h %ce %ae"

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