System administration command. fdisk displays information about disk partitions, creates and deletes disk partitions, and changes the
active partition. It is possible to assign a different operating system to each of the four possible primary partitions, though only one
partition is active at any given time. You can also divide a physical partition into several logical partitions. The minimum recommended
size for a Linux system partition is 40 MB. Normally, each device will be /dev/hda, /dev/hdb, /dev/sda, /dev/sdb, /dev/hdc, /dev/
hdd, and so on. An interactive, menu-driven mode is also available. Note that this command can be destructive if used improperly.
Options -b sectorsize
Set the size of individual disk sectors. May be 512, 1024, or 2048. Most systems now recognize sector sizes, so this is not necessary. -l List partition tables and exit. -u Report partition sizes in sectors instead of cylinders. -s partition
Display the size of partition, unless it is a DOS partition. -v Print version number, then exit. -C cylinders
Specify the number of cylinders on the disk. -H heads
Specify the number of heads per cylinder. -S sectors
Specify sectors per track for partitioning.
Commands a Toggle a bootable flag on current partition. b Edit disklabel of a BSD partition. c Toggle DOS compatibility flag. d Delete current partition. l List all partition types. m Main menu. n Create a new partition; prompt for more information. o Create an empty DOS partition table. p Print a list of all partitions and information about each. q Quit; do not save. t Replace the type of the current partition. u Modify the display/entry units, which must be cylinders or sectors. v Verify: check for errors, and display a summary of the number of unallocated sectors. w Save changes and exit. x Switch to expert commands.
Examples:
fdisk -l Show disks partitions sizes and types (run as root)
