mke2fs

Create a Linux filesystem inside a partition. More information: https://manned.org/mke2fs.

• Create an ext2 filesystem in partition 1 of device b (sdb1):

mkfs.ext2 /dev/sdb1

• Create an ext3 filesystem in partition 1 of device b (sdb1):

mkfs.ext3 /dev/sdb1

• Create an ext4 filesystem in partition 1 of device b (sdb1):

mkfs.ext4 /dev/sdb1