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I have several Lua scripts I use a lot when working with larger projects. For a long time I simply copied them to a new folder whenever I started a new project.
This works fine, however, I end up with many versions of the same file, and copying and keeping them in sync is a hassle. It doesn’t have to be that way.
I decided to use ~/Software/lua as my library of scripts. You can configure LUA_PATH to point to additional directories where it can look for more programs. You just need to add this line to your shell configuration:
export LUA_PATH=";;$HOME/Software/lua/?.lua"
Lua replaces the double semicolon ;; with the paths that it uses to search for scripts by default. The question mark ? gets replaced with the argument you provide to require.
Now I can just maintain a central directory where all my Lua scripts live. Neat.