I needed to find out the amount of data stored in a group of folders. Each of the folders contains a web site, and I want to track the sites on-disk usage statistics.
Linux system running bash.
du binary (typically induced in linux base install or busybox.
Tested on Ubuntu 12.
du -shc *
s ..... Summary
h ..... Human Readable. K, M, and G for sizes.
c ..... Summary or Total
* ..... All files or folders in the current directory.
For more info: http://ss64.com/bash/du.html