Examples:
diskutil
Display a list of diskutil's options.
diskutil info /
List information on the boot volume.
diskutil info /Volumes/Data
List information on a mounted (non-boot) volume named "Data".
diskutil info /dev/disk0s9
List information on partion #9 of disk #0.
sudo diskutil repairDisk /Volumes/Data
Repair the file structure on the volume "Data" (note: this unmounts the volume during repair).
sudo diskutil repairPermissions /
Repair the file permissions on the boot volume.
sudo diskutil enableJournal /
Enable HFS+ journaling on the boot volume.
sudo diskutil disableJournal /
Disable HFS+ journaling on the boot volume.
diskutil
Disk Utility Tool
Utility to manage local disks and volumes
Most options require root access to the device
Usage: diskutil [quiet]
list (List the partitions of a disk)
info[rmation] (Get information on a specific disk or partition)
listFilesystems (List file systems available for formatting)
activity (Continuous log of system-wide disk arbitration)
u[n]mount (Unmount a single volume)
unmountDisk (Unmount an entire disk (all volumes))
eject (Eject a disk)
mount (Mount a single volume)
mountDisk (Mount an entire disk (all mountable volumes))
enableJournal (Enable HFS+ journaling on a mounted HFS+ volume)
disableJournal (Disable HFS+ journaling on a mounted HFS+ volume)
moveJournal (Move the HFS+ journal onto another volume)
enableOwnership (Treat as exact User/Group IDs for a mounted volume)
disableOwnership (Ignore on-disk User/Group IDs for a mounted volume)
rename[Volume] (Rename a volume)
verifyVolume (Verify the file system data structures of a volume)
repairVolume (Repair the file system data structures of a volume)
verifyDisk (Verify the components of a partition map of a disk)
repairDisk (Repair the components of a partition map of a disk)
verifyPermissions (Verify the permissions of a Mac OS X volume)
repairPermissions (Repair the permissions of a Mac OS X volume)
eraseDisk (Erase an existing disk, removing all volumes)
eraseVolume (Erase an existing volume)
reformat (Erase an existing volume with same name and type)
eraseOptical (Erase optical media (CD/RW, DVD/RW, etc.))
zeroDisk (Erase a disk, writing zeros to the media)
randomDisk (Erase a disk, writing random data to the media)
secureErase (Securely erase a disk or freespace on a volume)
partitionDisk ((re)Partition a disk, removing all volumes)
resizeVolume (Resize a volume, increasing or decreasing its size)
splitPartition (Split an existing partition into two or more)
mergePartitions (Combine two or more existing partitions into one)
appleRAID
coreStorage
diskutil
