Add List All Authors On Git Repository as a Git TIL

git/list-all-authors-on-git-repository.md

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+# List All Authors On Git Repository
+
+The `git log` is the ledger of all commits made to the repository. If I am on
+the `main` branch and I have the latest pulled from the remote, then running
+`git log` will be a complete listing of all commits.
+
+`git log` includes more information than just authorship. I can narrow that all
+down to only author name and author email using the `--format` flag. For all the
+format string options available, I can run `man git-log` and jump to the `PRETTY
+FORMATS` section, scrolling just past the built-in formats.
+
+The two I am interested in are `%an` (Author Name) and `%ae` (Author Email). I
+can arrange these however I want in the format string argument. Here is what it
+looks like for the [`egghead-next`
+project](https://github.com/skillrecordings/egghead-next):
+
+```bash
+❯ git log --format='%an <%ae>'
+Zac Jones <zacjones93@gmail.com>
+Zac Jones <zacjones93@gmail.com>
+Zac Jones <zacjones93@gmail.com>
+Zac Jones <zacjones93@gmail.com>
+Zac Jones <zacjones93@gmail.com>
+Zac Jones <zacjones93@gmail.com>
+Zac Jones <zacjones93@gmail.com>
+John Lindquist <johnlindquist@gmail.com>
+Zac Jones <zacjones93@gmail.com>
+...
+```
+
+I get _name_ followed by _email_ wrapped in angle brackets. This is only so
+useful though because I am going to see tons duplicate authors especially for a
+project with hundreds and thousands of commits. I can narrow this down with [a
+deduplication trick via
+`awk`](unix/deduplicate-list-while-preserving-original-order.md):
+
+```bash
+❯ git log --format='%an <%ae>' | awk '!seen[$0]++'
+Zac Jones <zacjones93@gmail.com>
+John Lindquist <johnlindquist@gmail.com>
+Josh Branchaud <jbranchaud@gmail.com>
+Vojta Holik <vojta@egghead.io>
+Creeland A. Provinsal <cree@egghead.io>
+joel <joelhooks@gmail.com>
+Creeland <cree@provinsal.com>
+...
+```
+
+That's already a big improvement. The only other change I want to make is
+related to the default ordering of `git log`. It lists out commits in descending
+order (most recent first). I want to see authors listed in the order that they
+first committed to the project. Adding in the `--reverse` flag will solve for
+that.
+
+```bash
+❯ git log --reverse --format='%an <%ae>' | awk '!seen[$0]++'
+Joel Hooks <joelhooks@gmail.com>
+johnlindquist <johnlindquist@gmail.com>
+John Lindquist <johnlindquist@gmail.com>
+William Johnson <w.alexander.johnson@gmail.com>
+depfu[bot] <23717796+depfu[bot]@users.noreply.github.com>
+Evgeniy Nagalskiy <evgeniy.nagalskiy@gmail.com>
+Taylor Bell <taylorbell@gmail.com>
+Maggie Appleton <maggie.fm.appleton@gmail.com>
+...
+```
+
+See `man git-log` for more details.