devtodo software package provides hierarchical, prioritised todo list manager, 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 devtodo
devtodo is installed in your system.
Make ensure the devtodo package were installed using the commands given below,
$ sudo dpkg-query -l | grep devtodo *
You will get with devtodo package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Utilities |
| Package | devtodo |
| Version | 0.1.20-6.1 |
| Description | hierarchical, prioritised todo list manager |
| Sub Section | Utils |