Move pages back into a "pages" folder

pages/osx/du.md

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+# du
+
+> Estimate file space usage
+
+- get a sum of the total size of a file/folder in human readable units
+
+`du -sh {{file/directory}}`
+
+- list file sizes of a directory and any subdirectories in KB
+
+`du -k {{file/directory}}`
+
+- get recursively, individual file/folder sizes in human readable form
+
+`du -ah {{directory}}`
+
+- list the KB sizes of directories for N levels below the specified directory 
+
+`du -k -depth=1 {{directory}}`