dfps prints out a df of all of the plasma group home & data disk partitions. If on arguments are present, the list is sorted by the amount of space available. if ther is one argument which is between 1-4 (inclusive), the sort is by that field+1 of the df output. if there is more than one argument , or the first argument is < 1 or > 4 the output line are limeten to the width of the current window