Use Find instead of Globstar

Globstar allows you to recursively search through a directory:

That would look something like this:

shopt -s globstar

for f in $(ls **/*.html); do
  echo $f
done

Globstar, however, requires bash 4.X, which mac doesn't have (it defaults to 3.X).

Instead, we can find all ".html" files in the current directory recursively using find.

for f in $(find . -name ; do
  echo $f
done

No more bash 4.X+ required!