Cookbook.md

@@ -9,6 +9,10 @@
 ```shell
 for file in $(git status --porcelain --untracked=all | cut -b 4- | grep "\.png$") ; do pngcrush -brute -ow $file; done
 ```
+or with output showing size changes:
+```shell
+for file in $(git status --porcelain --untracked=all | cut -b 4- | grep "\.png$") ; do oldSize=$(ls -l $file | cut -d " " -f 5 ); pngcrush -q -brute -ow $file; newSize=$(ls -l $file | cut -d " " -f 5); echo "$file $oldSize -> $newSize"; done     
+```
 
 * sizes of things in C#:
 ```