/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *149.1 Gi   disk0
   1:                        EFI                         200.0 Mi   disk0s1
   2:                  Apple_HFS Untitled 1              37.1 Gi    disk0s2
   3:                  Apple_HFS Untitled 1_2            37.1 Gi    disk0s3
   4:                  Apple_HFS Untitled 1_2            37.0 Gi    disk0s4
   5:                  Apple_HFS Untitled 1_2_2          37.1 Gi    disk0s5


/dev/disk0s2    37Gi   97Mi   37Gi     1%    /Volumes/Untitled 1
/dev/disk0s3    37Gi   54Mi   37Gi     1%    /Volumes/Untitled 1_2 1
/dev/disk0s5    37Gi   54Mi   37Gi     1%    /Volumes/Untitled 1_2_2


which is the one with the present osx install?