In *buntu 20.04, I have cal and ncal. But yes, any common cal utility that generates week numbers is a better solution than cal -y | ... | wc -l. I understand

In *buntu 20.04, I have cal and ncal. But yes, any common cal utility that generates week numbers is a better solution than cal -y | ... | wc -l. I understand your preference for a lean file system. In this challenge, I needed more than awk (because of arrays) and wanted an explicit solution that works regardless of calendar language.