so babashka calls read on each line of input to make *input* ?

yes, when -I is used

A problem with babashka, or a problem with too many tmux windows to keep track of? 🙂

Haha

Related to that, I searched around for ways to sum up numbers, and the other options range from mildly opaque to downright cryptic.

The babashka version is definitely the most straightforward, especially to a clojurian

things like awk '{total += $1}END{ print total}'

yeah, or dc -f - -e '[+z1<r]srz1<rp'

explanation: https://stackoverflow.com/a/453290