hexedit software package provides view and edit files or devices in hexadecimal or ASCII, 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 hexedit
hexedit is installed in your system.
Make ensure the hexedit package were installed using the commands given below,
$ sudo dpkg-query -l | grep hexedit *
You will get with hexedit package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Editors |
| Package | hexedit |
| Version | 1.2.13-3 |
| Description | view and edit files or devices in hexadecimal or ASCII |
| Sub Section | Editors |