Comment by pxc

> Shell script authors like yourself make me very happy.

Shell script is really good for some things, so we're gonna end up writing it. And if we write it, it might as well be legible, right? Shell scripts deserve the same care that other programs do.

> This lets you trace any script just by setting the environment variable. And it’s nounset-safe.

Nice! I think I'll start adding the same.

> This was typed from memory on mobile so if the above is bugged, my bad :)

I think it's fine aside from the smart quote characters your phone inserted instead of plain vertical double quotes around the parameter expansion you use to make the line nounset-friendly!