+# COLUMN is set to `| column -t` if it's available, empty otherwise.
+
+# Display all files (-s), use human readable sizes (-h) and display the
+# complete size (-c).
+alias du='du -shc'
+# Use human readable sizes and format it nicely, thanks to climagic
+# (http://twitter.com/climagic/status/49623386762129408).
+alias df='df -hP COLUMN'