>

> This might be a good one to ask the users.
>

> fsmithred
>


Agreed.

But if you did want to do it programmatically without parsing every sources.{d/*,conf}...
Ask apt what it is cacheing...

if [ -n "$(apt-cache policy | grep 'buster/non-free')" ]; then
echo "yes include non-free repo";
else

echo "no don't!";
fi