Add Show The Disk Usage For The Current Directory as a unix til

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

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+# 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.