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What is the purpose of the command 'quotaon'?

To disable user quotas
To display user quotas
To enable user quotas
To reset user quotas

The correct answer is: To enable user quotas

The command 'quotaon' is used to enable user quotas on a filesystem. Quotas are used to limit the amount of disk space and/or the number of inodes that users can consume. Before quotas can be enforced, they must first be activated with the 'quotaon' command. This command instructs the operating system to start enforcing the quota limits that have been configured for users or groups on specified filesystems. Enabling quotas is an essential step in managing resources effectively on a server, as it helps prevent any single user from consuming all available disk space, which can lead to service interruptions and decreased system performance. Once quotas are enabled with 'quotaon', they can be monitored or modified using other commands as necessary.