Which command checks the quota limits for a user?

The command that checks the quota limits for a user is the quota command. When executed, it provides specific information about the user's disk space and inode usage across different mounted file systems that enforce disk quotas. This command is instrumental for users who want to monitor their own resource consumption and ensure they stay within the allowed limits set by the system administrator.

The other options serve different purposes within the context of managing quotas. For example, edquota is used to edit the quota limits for a user or group, allowing administrators to modify the number of allowed blocks or inodes. Repquota is used for reporting the quota usage for all users in a filesystem, aimed mainly at administrators to keep track of resource distribution. Quotacheck is a command to scan the file systems for usage information and update the quota files, but it does not display a user's current quota like the quota command does. Each of these commands plays a distinct role in the management of disk quotas, but to simply check a user's quota limits, the quota command is the correct choice.