the above command is used to view all partitions in the system

view partition on a specific disk

it check size of the partition of the partitonn 

This lists all available disks, partitions, their sizes, and filesystem types.

This displays partition details only for /dev/sda.

This opens /dev/sdb in fdisk interactive mode for partitioning.

Inside the fdisk prompt:

• Press n (new partition)
• Choose partition type (p for primary, e for extended)
• Set partition number (e.g., 1)
• Define the first and last sector (default is full size)
• Press w to save changes

Inside the fdisk prompt:

• Press d (delete partition)
• Select partition number to delete
• Press w to save changes

Inside the fdisk prompt:

• Press t (change type)
• Select partition number
• Enter the partition type code (e.g., 83 for Linux, 82 for swap)
• Press w to save changes

• Inside fdisk, press p to print the partition table.
• If satisfied, press w to save changes.
• If not, press q to quit without saving.

This formats partition /dev/sdb1 as an ext4 filesystem.

This turns /dev/sdb2 into a swap partition and enables it.

Run fdisk to Delete and Recreate Partition with the Same Start Sector:

sudo fdisk /dev/sdb

Inside fdisk:

• Press d to delete the partition.
• Press n to create a new partition.
• Set the same start sector but adjust the end sector.
• Press w to save changes.

Resize the Filesystem:

sudo resize2fs /dev/sdb1

A tool to manipulate disk partitions.