How can I get the dev name associated to a Volume name?
Solution 1:
mount | grep /Volumes/foo | cut -d ' ' -f1
or
mount | awk '/Volumes\/foo/ { print $1 }'
Solution 2:
You can just use the volume name with diskutil though, there's no need to get the identifier:
$ diskutil unmount VolumeName
Volume VolumeName on disk1s1 unmounted