Which command is used to modify filesystem parameters in Linux?

The command used to modify filesystem parameters in Linux is related to the filesystem management utilities. The chosen answer involves a command that specifically has the functionality to make modifications to filesystem structures or settings.

The tune2fs command is used for adjusting tunable filesystem parameters on an ext2, ext3, or ext4 filesystem. With tune2fs, an administrator can modify various parameters such as the frequency of file system checks, reserve blocks for root users, and other settings that can optimize the performance and integrity of the filesystem. This is particularly important for maintaining and improving the functionality of a filesystem.

In contrast, fsck is primarily used to check and repair inconsistent filesystem states, but it does not modify filesystem parameters by itself. mdadm is used for managing Linux software RAID arrays, and while it is essential for managing disk arrays, it does not directly deal with modifying filesystem parameters. Meanwhile, dumpe2fs is a command that displays superblock and block group information for an ext2/ext3/ext4 filesystem without making any modifications.

Therefore, the selection of the command that directly enables modifications to filesystem parameters correctly identifies tune2fs as the appropriate choice.