Add Find The Initial Commit as a git til

README.md

@@ -75,6 +75,7 @@ _317 TILs and counting..._
 - [Determine The Hash Id For A Blob](git/determine-the-hash-id-for-a-blob.md)
 - [Dry Runs in Git](git/dry-runs-in-git.md)
 - [Excluding Files Locally](git/excluding-files-locally.md)
+- [Find The Initial Commit](git/find-the-initial-commit.md)
 - [Grab A Single File From A Stash](git/grab-a-single-file-from-a-stash.md)
 - [Grep Over Commit Messages](git/grep-over-commit-messages.md)
 - [Ignore Changes To A Tracked File](git/ignore-changes-to-a-tracked-file.md)

git/find-the-initial-commit.md

@@ -0,0 +1,16 @@
+# Find The Initial Commit
+
+By definition, the initial commit in a repository has no parents. You can
+exploit that fact and use `rev-list` to find the initial commit; a commit
+with no parents.
+
+```bash
+$ git rev-list --max-parents=0 HEAD
+```
+
+The `rev-list` command lists all commits in reverse chronological order. By
+restricting them to those with at most 0 parents, you are only going to get
+root commits. Generally, a repository will only have a single root commit,
+but it is possible for there to be more than one.
+
+See `man git-rev-list` for more details.