Update cheatsheets

git-merge-base

@@ -0,0 +1,21 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# git merge-base
+
+> Find a common ancestor of two commits.
+> More information: <https://git-scm.com/docs/git-merge-base>.
+
+- Print the best common ancestor of two commits:
+
+`git merge-base {{commit_1}} {{commit_2}}`
+
+- Print all best common ancestors of two commits:
+
+`git merge-base --all {{commit_1}} {{commit_2}}`
+
+- Check if a commit is an ancestor of a specific commit:
+
+`git merge-base --is-ancestor {{ancestor_commit}} {{commit}}`