Add Root Directory Of A Project as an elixir til

README.md

@@ -7,7 +7,7 @@ variety of languages and technologies. These are things that don't really
 warrant a full blog post. These are mostly things I learn by pairing with
 smart people at [Hashrocket](http://hashrocket.com/).
 
-_478 TILs and counting..._
+_479 TILs and counting..._
 
 ---
 
@@ -100,6 +100,7 @@ _478 TILs and counting..._
 - [Quitting IEx](elixir/quitting-iex.md)
 - [Replace Duplicates In A Keyword List](elixir/replace-duplicates-in-a-keyword-list.md)
 - [Reversing A List](elixir/reversing-a-list.md)
+- [Root Directory Of A Project](elixir/root-directory-of-a-project.md)
 - [Round Floats To Integers](elixir/round-floats-to-integers.md)
 - [Run ExUnit Tests In A Deterministic Order](elixir/run-exunit-tests-in-a-deterministic-order.md)
 - [String Interpolation With Just About Anything](elixir/string-interpolation-with-just-about-anything.md)

elixir/root-directory-of-a-project.md

@@ -0,0 +1,15 @@
+# Root Directory Of A Project
+
+Do you need the root directory of an elixir project? The
+[`File.cwd!/0`](http://elixir-lang.org/docs/stable/elixir/File.html#cwd!/0)
+function can help.
+
+```elixir
+iex> File.cwd!
+"/home/dev/code/my_app"
+```
+
+Keep in mind though, this will only work reliably with projects that are
+compiled using Mix.
+
+[source](https://groups.google.com/forum/#!msg/elixir-lang-talk/Ls0eJDdMMW8/1Lmg5K2MAQAJ)