dfc software package provides display file system usage using graph and colors, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install dfc
dfc is installed in your system.
Make ensure the dfc package were installed using the commands given below,
$ sudo dpkg-query -l | grep dfc *
You will get with dfc package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Utilities |
| Package | dfc |
| Version | 3.0.5-0.1 |
| Description | display file system usage using graph and colors |
| Sub Section | Utils |