How to display a list of unmounted partitions with sizes in linux?

Question

linux

Hello,
I have a virtual machine with debian7. The root directory and all service are on /dev/sda. There is an unallocated /dev/sdb. I partition fdisk /dev/sdb to /dev/sdb1 and /dev/sdb2 and /dev/sdb5. Now I have to create filesystems on the new partitions, but suppose I forgot the size of the partitions on /dev/sdb in gigabytes, how do I look at this before creating the fs and mounting the created partitions?

Answer 1

lsblk