Print free disk space in bytes, not blocks

build/scripts/diskFree.sh

@@ -1,3 +1,3 @@
 #!/usr/bin/env sh
-df -Pk . | sed 1d | grep -v used | awk '{ print $4 "\t" }'
+df -P B1 . | sed 1d | grep -v used | awk '{ print $4 "\t" }'