Add Show The Disk Usage For The Current Directory as a unix 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/).
 
-_421 TILs and counting..._
+_422 TILs and counting..._
 
 ---
 
@@ -388,6 +388,7 @@ _421 TILs and counting..._
 - [Search History](unix/search-history.md)
 - [Search Man Page Descriptions](unix/search-man-page-descriptions.md)
 - [Securely Remove Files](unix/securely-remove-files.md)
+- [Show Disk Usage For The Current Directory](unix/show-disk-usage-for-the-current-directory.md)
 - [SSH Escape Sequences](unix/ssh-escape-sequences.md)
 - [SSH With Port Forwarding](unix/ssh-with-port-forwarding.md)
 - [Sort In Numerical Order](unix/sort-in-numerical-order.md)

unix/show-disk-usage-for-the-current-directory.md

@@ -0,0 +1,39 @@
+# Show Disk Usage For The Current Directory
+
+The `du` utility can be used to show disk usage for a particular directory
+or set of directories. When used without any arguments, it will show the
+disk usage for the current directory.
+
+```bash
+$ du
+80      ./.git/hooks
+8       ./.git/info
+256     ./.git/logs/refs/heads
+...
+```
+
+with the `-h` command we can see it all in a human-readable format
+
+```bash
+$ du -h
+ 40K    ./.git/hooks
+4.0K    ./.git/info
+128K    ./.git/logs/refs/heads
+```
+
+and to get an even clearer picture we can pipe that through `sort -nr`
+
+```bash
+$ du -h | sort -nr
+412K    ./vim
+352K    ./postgres
+340K    ./.git/logs
+216K    ./.git/logs/refs
+184K    ./ruby
+156K    ./unix
+148K    ./git
+...
+```
+
+This sorts it numerically in reverse order putting the largest stuff at the
+top.