intable,s,a,,,,"Input tables"
outtable,s,a,,,,"Output tables"
expr,s,a," ",,,"Expression used for selection"
columns,s,a," ",,,"Column names"
sort,s,a," ",,,"Columns to sort on"
uniq,b,h,no,,,"Unique rows?"
ascend,b,h,yes,,,"Ascending order?"
casesens,b,h,yes,,,"Case sensitive sort?"
mode,s,h,"a",,,