cbm software package provides display the current network traffic in 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 cbm
cbm is installed in your system.
Make ensure the cbm package were installed using the commands given below,
$ sudo dpkg-query -l | grep cbm *
You will get with cbm package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Utilities |
| Package | cbm |
| Version | 0.1-10+b2 [amd64, arm64, armel |
| Description | display the current network traffic in colors |
| Sub Section | Utils |