I wish there were a set of tools like coreutils but like..."less surprising" I guess? Like I spend 98% of my focus-time in algol-likes. 1-indexing drives me batty. I always have to try a few times to craft craft cut or tail expressions to match [i:j] slice notation.
And anything more complex than that I typically just use python.
And anything more complex than that I typically just use python.