Install geany-plugin-insertnum by entering the following commands in the terminal:
sudo apt update sudo apt install geany-plugin-insertnum
Description:
number inserting plugin for Geany
This plugin for Geany replaces a (possibly zero-width) rectangular selection with integer numbers, using start/step/base etc. specified by the user. For practical reasons, the number of lines is limited to 500000. . Geany is a small and lightweight integrated development environment using the Gtk+ toolkit.
Homepage: http://plugins.geany.org
Version: 1.32+dfsg-3
Section: universe/devel