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blockdev [options] commands devices
blockdev --report [devices]
The utility blockdev allows one to call block device ioctls from the
-V Print version and exit.
-q Be quiet.
-v Be verbose.
Print a report for devices. Note that the partition StartSec is
in 512-byte sectors.
Get read-only. Print 1 if the device is read-only, 0 otherwise.
Print sectorsize in bytes - usually 512.
Print blocksize in bytes.
Set blocksize to N bytes. Note that the block size is specific
to the current file descriptor opening the block device, so the
change of block size only persists for as long as blockdev has
the device open, and is lost once blockdev exits.
Print device size in sectors (BLKGETSIZE). Deprecated in favor
of the --getsz option.
Print device size in bytes (BLKGETSIZE64)
Get size in 512-byte sectors (BLKGETSIZE64 / 512).
Reread partition table.
blockdev was written by Andries E. Brouwer.
The blockdev command is part of the util-linux-ng package and is avail-
able from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.
Jun 2007 BLOCKDEV(8)