I think it would take at least a half hour, unless you have directory traversal, file I/O, and regex APIs memorized which most people don't. That's "trivial" in the grand scheme of things but it's really not practical to do day-in and day-out every time some random scripting necessity arises.

And you presumably have to clutter up your filesystem with random project files, etc, which is annoying. Are you going to have 1000 of these, one for every time you need to do some sort of minor task like this?

That command, on the other hand, took me 2 or 3 minutes to write, and I had to look up the syntax for `mktemp`. If I had remembered the mktemp syntax it would have taken a few seconds.