quota displays users' disk usage and limits. Only a privileged user may use the optional username argument to view the limits of other users.
quota without options displays only warnings about mounted filesystems where quotas are turned on and usage is over quota. Remotely mounted filesystems which do not have quotas turned on are ignored.
username can be numeric, corresponding to the UID of a user.
The -v option displays user's quotas on all mounted filesystems where quotas are turned on.