quota —
display disk usage and limits
  
    | quota | [ -hu] [-v|-q] user | 
  
    | quota | [ -gh] [-v|-q] group | 
quota displays users' disk usage and limits. By default
  only the user quotas are printed.
Options:
  - -d
- Query the kernel for default user or group quota instead of a specific
      user or group.
- -g
- Print group quotas. By default, print group quotas for all groups the user
      belongs to.
- -h
- Numbers are displayed in a human readable format.
- -q
- Print a more terse message, containing only information on file systems
      where usage is over quota.
- -u
- Print user quotas. This is the default.
- -v
- quotawill display quotas on file systems where no
      storage is allocated.
Specifying both -g and
    -u displays both the user quotas and the group
    quotas (for the user).
Only the super-user may use the optional
    user argument with the -u flag
    to view quotas for other users. Non-super-users can use the optional
    group argument with the -g
    flag to view only the limits of groups they belong to.
The -q flag takes precedence over the
    -v flag.
quota tries to report the quotas of all
    mounted file systems. If the file system is mounted via
    NFS it will attempt to contact the
    rpc.rquotad(8) daemon on
    the NFS server. If quota exits
    with a non-zero status, one or more file systems are over quota.
The quota command appeared in
  4.2BSD.