The du command shows the disk space used.
Use:
du -s -h .
Where:
-s (--summarize): Display only a total for each argument.
-h (--human-readable): Print sizes in human-readable format (e.g., 1K 234M 2G).
.: Indicates the current directory.
Example:
mcaliman@deimos:~# du -s -h .
537M .