Space A Directory Is Using

Can someone refresh my memory on the Linux command that tells you how much space the contents of a directory is taking up on the disk?

 

df

must type in other stuff to meet the required minimum 10 characters (said in a droning computer voice).

 

I think you want the disk usage command: du -sh <directory> or du -sh . for the current directory.

 

Ahem. yup, that's correct. I do both, thus my confusion!