quota—displays users' disk usage and limits

quota [ -guvv | q ]
quota [ -uvv | q ] user
quota [ -gvv | q ] group

quota displays users' disk usage and limits. By default, only the user quotas are printed.

-g Prints group quotas for the group of which the user is a member.
-u An optional flag, equivalent to the default.
-v Displays quotas on file systems where no storage is allocated.
-q Prints a more terse message, containing only information on file systems where usage is over quota.

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