Comment by randusername
10 hours ago
Thanks for sharing, this is much better, though I actually think it is the perfect example to explain something that is brain-slippery about jq
look at $cols | $cols
my brain says hmm that's a typo, clearly they meant ; instead of | because nothing is getting piped, we just have two separate statements. Surely the assignment "exhausts the pipeline" and we're only passing null downstream
the pipelining has some implicit contextual stuff going on that I have to arrive at by trial and error each time since it doesn't fit in my worldview while I'm doing other shell stuff
I totally agree, it did take me a while to come to terms with the syntax of assigning variables specifically due to that pipe at the end. I guess sometimes we just have to know the quirks of the relevant tooling we use. I used to use PHP heavily in the 4 and 5 days, and kinda got used to all the quirks it had. So during reviews, I would pick up a lot of issues some of my colleagues did not.
Interestingly some things do use a semicolon in jq, specifically while, until, reduce and some others I can't remember right now.