Apple - How to tell if I'm using HFS+ or APFS?
The easiest way is using the diskutil command line as follows:
diskutil info /
You will see a report which will include something like this for an APFS formatted storage:
Volume Name: Macintosh HD
Mounted: Yes
Mount Point: /
Partition Type: 41504752-0000-11AA-AA23-01306543EFEA
File System Personality: APFS
Type (Bundle): apfs
Name (User Visible): APFS
Owners: Enabled
See under Type to determine what kind of file system is on your root volume.
This will be displayed on an HFS formatted storage:
Volume Name: Macintosh HD
Mounted: Yes
Mount Point: /
Partition Type: Apple_HFS
File System Personality: Journaled HFS+
Type (Bundle): hfs
Name (User Visible): Mac OS Extended (Journaled)
Journal: Journal size 155648 KB at offset 0x3a38000
Owners: Enabled
If you want to automate this or use the results in a script, you can use following one-liner:
/usr/libexec/PlistBuddy -c "Print :FilesystemType" /dev/stdin <<< $(diskutil info -plist /)
Which will produce output:
apfs
or
hfs