display usage and quota information
-g -- display group quota information
-p -- display project quota information
-u -- display user quota information
-b -- display number of blocks used
-i -- display number of inodes used
-r -- display number of realtime blocks used
-h -- report in a human-readable format
-n -- skip identifier-to-name translations, just report IDs
-N -- suppress the initial header
-v -- increase verbosity in reporting (also dumps zero values)
-f -- send output to a file
The (optional) user/group/project can be specified either by name or by
number (i.e. uid/gid/projid).
