How much disk space am I using?

The following commands can report how much disk space your files consume:

bigfiles
Prints the names and sizes of the largest files in your current directory and its subdirectories.
du -h
Recursively summarizes disk use.
ls -lh
Lists size of all files in the current directory.
ls -lhR
Lists size of all files in the current directory and its subdirectories.
quota
Reports your disk quota and current utilization.