How do I get the size of a directory on the command line?

df -h .; du -sh -- * | sort -hr

imza@debian03:~$ df -h .; du -sh -- * | sort -hr
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda1        58G  6.7G   49G  13% /
207M	Downloads
4.0K	Videos
4.0K	test.sh
4.0K	Templates
4.0K	Public
4.0K	Pictures
4.0K	Music
4.0K	Documents
4.0K	Desktop
0	test
imza@debian03:~$