Which command creates filesystems under Linux?

The command that creates filesystems under Linux is "mke2fs" (commonly referred to as "make ext2 filesystem"). The option presented seems to have a typographical error. The correct command would typically be 'mke2fs', which is specifically designed for this purpose. It formats a partition or a storage device with the ext2, ext3, or ext4 filesystem, allowing the creation of a structured filesystem on that device.

Other commands in the list serve different functions: "dumpe2fs" provides detailed information about a filesystem on a device. "mdadm" is used for managing Linux software RAID arrays, which is not directly related to filesystem creation. "fsck" is used for checking and repairing filesystems, not creating them.

Understanding the purposes of these commands helps clarify their specific roles in Linux system management, and the creation of filesystems through "mke2fs" is a fundamental operation for preparing storage for use in the system.