>>>>> On Thu, 13 Jun 2024, Ulrich Mueller wrote:

>> +	if $append; then

> Please use the conventional coding style, i.e. ${append}.

Or rather, assign the variable to empty or non-empty and test for
[[ -n ${append} ]] instead of executing it as a true or false command.

(I'm pretty sure that there was a previous discussion on this, but I
fail to find it.)