mke2fs

Creates 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}}