Modify an existing quota record.  The UIC must be specifed;
  it may contain wild cards. Only those attributes of the quota
  record explicitly specified will be modified.

  FORMAT:
   MODIFY <uic> </PERMQUOTA=n> </OVERDRAFT=n>

  EXAMPLE:
   MODIFY [11,17] /PERMQUOTA=30000

  This will set the permquota limit for UIC [11,17] to 30000.
  The overdraft limit is not modified.

1    /OVERDRAFT

  This qualifer allows the user to specify how many blocks
  (decimal) that a user with a given UIC may use on a given
  volume, OVER AND ABOVE the user's PERMQUOTA limit.  If
  this qualifier is not present or no value is specified, the
  field in the record is not modified.

  EXAMPLE:
   MODIFY [11,17] /OVERDRAFT=200

  This will modify the quota record for UIC [11,17] to set the
  overdraft limit to 200 blocks.

2    /PERMQUOTA

  This qualifier allows the user to specify how many blocks
  (decimal) that a user with a given UIC may use on given volume.
  this qualifier is not present or no value is specified, the
  field in the record is not modified.

  EXAMPLE:
   MODIFY [11,17] /PERMQUOTA=25000

  This will modify the quota record for UIC [11,17] to set the
  permanent quota to 25000 blocks.