In my faffing about with text editors, I ran into something kind of funny:
So, there's not a straightforward way to install vi (not vim) on termux. There is, however, a copy of ed in the base install.
And so I started poking at it. Amusingly, it turns out to be a surprisingly decent editor for the constraint that is grumpily poking at a piece of glass with my thumbs.
I'm sure @ed1conf will be delighted.



