Creating case sensitive/insensitive volumes (https://www.dssw.co.uk/reference/diskutil.html)
# For case insensitive
diskutil apfs addVolume disk1 APFS <Volume name>
# For case sensitive
diskutil apfs addVolume disk1 "Case-sensitive APFS" <Volume name>
The newly created volume will be mounted to the /Volume/<Volume name>
Thank you. Shame on the help output not making this obvious.
Note in the latest Mac OS it's
disk3
. Don't blindly execute this with disk 1.