Add What Is The Current Branch as a git til.

README.md

@@ -84,6 +84,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 - [Stashing Untracked Files](git/stashing-untracked-files.md)
 - [Untrack A File Without Deleting It](git/untrack-a-file-without-deleting-it.md)
 - [Verbose Commit Message](git/verbose-commit-message.md)
+- [What Is The Current Branch](git/what-is-the-current-branch.md)
 - [Whitespace Warnings](git/whitespace-warnings.md)
 
 ### go

git/what-is-the-current-branch.md

@@ -0,0 +1,13 @@
+# What Is The Current Branch?
+
+This question can be answered with one of git's plumbing commands,
+`rev-parse`.
+
+```
+$ git rev-parse --abbrev-ref HEAD
+```
+
+The `--abbrev-ref` flag tells `git-rev-parse` to give us the short name for
+`HEAD` instead of the SHA.
+
+[source](http://stackoverflow.com/a/12142066/535590)