Single-user mode to run fsck to check and repair your boot disk became tricky with Fusion Drives. With a T2 chip, it’s not practical in its traditional form.
Variables · Functions · Interpolation · Brace expansions · Loops · Conditional execution · Command substitution · One-page guide to Bash scripting
Source: Bash scripting cheatsheet
It may be over 2 years old, but its supporting tools are more like those of a beta. Adding containers isn’t at all straightforward.
Inside all those hidden settings which control App Nap to Trackpad scaling factors: what they are and how to set them.
What’s the quickest way to tear down all user apps and services? Or to force a restart? The answer is in the command tool launchctl.
Downloading runtime support from Apple can save you wondering why a tool appears to be broken.