Tips and tricks when booting things.
Contents
Booting
Mac
Many PCs
Linux
Built-in boot manager: Hold Option (or Alt) during boot
Built-in boot manager: `Hit Escape, Enter, or a function key (usually F8 or above) during boot.<http://www.rodsbooks.com/refind/bootcoup.html>`_
Firmware: Run “sudo systemctl reboot –firmware” and you don’t have to muck around trying to hit keys during boot.