What command is used to check and repair Linux filesystem quotas?

The command used to check and repair Linux filesystem quotas is quotacheck. This tool is specifically designed to examine the quota files on a filesystem and to make sure that they are consistent with the current state of the filesystem. It scans the files for any discrepancies and can fix issues related to user or group quotas. This is essential for maintaining proper quota enforcement on multi-user systems where resource usage needs to be managed.

In contrast, other commands serve different purposes. For example, fsck is used primarily for checking and repairing filesystem corruption but does not specifically address quota concerns. Similarly, edquota is utilized to edit user quotas, allowing administrators to set or adjust limits for users or groups, but it does not perform checks or repairs. The quota command provides various options to manage or report on user quotas but doesn’t perform any checks or repairs on the quotas themselves. Therefore, quotacheck is distinctly suited for managing filesystem quotas.