htp software package provides An HTML pre-processor, 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 htp
htp is installed in your system.
Make ensure the htp package were installed using the commands given below,
$ sudo dpkg-query -l | grep htp *
You will get with htp package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Web Software |
| Package | htp |
| Version | 1.19-2 |
| Description | An HTML pre-processor |
| Sub Section | Web |