get block size of linux drive partition or disk

show_block_size.sh

#!/usr/bin/env bash
# blockdev is in the util-linux package and the binary is in /sbin usually
# util-linux: /sbin/blockdev

# Display an error message if the partition (input) is not 
# Exit the shell script with a status of 1 using exit 1 command.
[ $# -eq 0 ] && { echo "Usage: $0 partion"; exit 1; }

PARTITION=$1
/sbin/blockdev --getbsz $PARTITION
# 
# thanks to SURENDRA ANNE: 
# https://www.linuxnix.com/find-block-size-linux/