I have a PDF A.pdf and B.pdf and would like to merge them both to AB.pdf, where each page is merged alternately so that page 1 in AB.pdf would be the first page of A.pdf and page 2 in AB.pdf would be the first page of B.pdf etc.
I would like to achieve that with an handy command in bash
on macOS 10.14.5
. How can I do that?