How can I extract the email of a commiter using git?

Question

If I have a specific string how can I use e.g git log to find the email of the committer from the command line?
I don't want to see the commit. I only want the "one-liner" command to give me only the email of the author.

NOTE: I do NOT have a commit id. I only have a search string. I mean a string that I know is part of a commit for sure.

Update after comment from @axiac:
I have a string X that is "unique" in the sense that is introduced by only 1 committer. The committer adds it to file foo.java.
I want having only the string X and foo.java to find the email of the commiter who added the string

*"I only have a string"* - you have to be more specific. What string do you have? I guess it's not the committer's email, you said it's not a commit hash. What is it then? A fragment from the commit message? A fragment from a file? Do you know the name of the file? — axiac, Aug 23 '15 at 17:32
@axiac:It is just a string that I know for sure it is part of *a* commit. — Jim, Aug 23 '15 at 18:12
It's still not clear. All the strings mentioned above (committer's name and email, commit message, commit date, file names and contents) are part of the commit. Which one is the one you know? — axiac, Aug 23 '15 at 18:18
@axiac: I only have a string that is "unique" in a sense that 99% of the time it will be introduced/affected by only 1 commiter. I did not have a specific file in mind but now that you mention it, it is for certain part of a certain file e.g. `foo.java`. I only need the email of the commiter — Jim, Aug 23 '15 at 19:47
No, more like `git log -G --pretty=%ce` You may need to pass in additional ref-specs if the commit you are after isn't reachable from HEAD. — Andrew C, Aug 24 '15 at 19:00
@AndrewC:I am sorry for my question, but I don't know what "additional ref-specs" is supposed to be — Jim, Aug 24 '15 at 20:12
Relevant question. Why so many downvotes? @Avalanche's answer is helpful. — Manu Manjunath, Jan 18 '21 at 07:41

score 7 · Answer 1 · answered Aug 23 '15 at 16:53

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git --no-pager log -s --format="%ae"

Source.

answered Aug 23 '15 at 16:53

Avalanche

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But I don't have a commit id. I only have a string – Jim Aug 23 '15 at 17:01
Very confusing description, try this solution http://stackoverflow.com/a/7124949/1125161 – Avalanche Aug 23 '15 at 17:23
You can also extract a unique list of emails by doing: `git --no-pager log -s --format="%ae" | sort | uniq` – Heziode Jun 14 '23 at 10:24

score 1 · Answer 2 · answered Aug 24 '15 at 04:27

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How about git log --grep="YOUR_SEARCH_REGEX" --pretty=format"%ce"

answered Aug 24 '15 at 04:27

David Neiss

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You should add `--all` to extend the search to the entire repo. – jub0bs Sep 07 '15 at 08:36

How can I extract the email of a commiter using git?

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