Add Delete All Untracked Files to git til.

README.md

@@ -10,6 +10,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 ### git
 
 - [Checkout Previous Branch](git/checkout-previous-branch.md)
+- [Delete All Untracked Files](git/delete-all-untracked-files.md)
 - [Intent To Add](git/intent-to-add.md)
 - [Staging Changes Within Vim](git/staging-changes-within-vim.md) 
 - [Stashing Untracked Files](git/stashing-untracked-files.md)

git/delete-all-untracked-files.md

@@ -0,0 +1,27 @@
+# Delete All Untracked Files
+
+Git provides a command explicitly intended for cleaning up (read: removing)
+untracked files from a local copy of a repository.
+
+> git-clean - Remove untracked files from the working tree
+
+Git does want you to be explicit though and requires you to use the `-f`
+flag to force it (unless otherwise configured).
+
+Git also gives you fine-grained control with this command by defaulting to
+only deleting untracked files in the current directory. If you want
+directories of untracked files to be removed as well, you'll need the `-d`
+flag.
+
+So if you have a local repository full of files you'd like to get rid of,
+just:
+
+```bash
+$ git clean -f -d
+```
+
+or just:
+
+```bash
+$ git clean -fd
+```