Blockdev

blockdev is a command that calls specific block-device ioctls, which perform specific tasks inside the operating system. It is useful for causing these actions from a shell script.

= Synopsis =

blockdev [-1] [-v] command ... device ...   blockdev --report device ... blockdev -h|-v

= Example Commands = See the manual page for a complete list.
 * --getpbsz get the physical block size
 * --getss get the logical sector size in bytes
 * --getsz get the size in 512-byte sectors

= Provided by = Most (all?) Linux distributions incorporate this from the [util-linux] project.

= External Links =
 * man7.org man page
 * Ubuntu bionic man page