diskutil eraseVolume jhfs+ "Macintosh HD" disk0s2
-bash-3.2# diskutil eraseVolume jhfs+ "Macintosh HD" disk0s2
Started erase on disk0s2 Macintosh HD
Unmounting disk
Erasing
Initialized /dev/rdisk0s2 as a 233 GB HFS Plus volume with a 24576k journal
Mounting disk
Finished erase on disk0s2 Macintosh HD
-bash-3.2#
/dev/disk14
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *256.1 GB disk14
1: EFI 209.7 MB disk14s1
2: Apple_HFS yosemite 19.4 GB disk14s2
3: Apple_Boot Recovery HD 784.2 MB disk14s3
4: Apple_HFS el_capitan 19.4 GB disk14s4
5: Apple_Boot Recovery HD 650.0 MB disk14s5
6: Apple_HFS sierra 20.0 GB disk14s6
7: Apple_HFS high-sierra 34.3 GB disk14s7
8: Apple_Boot Recovery HD 650.0 MB disk14s8
9: Apple_HFS data 160.2 GB disk14s9