example:
Convert the double columns of APS.twi to float (note that col1, col2,col3
are the column names in APS.twi file):
sddscast APS.twi -cast=col,*,double,float
sddscast APS.twi -cast=col,'(col1,col2,col3)',double,float
sddscast APS.twi -cast=col,'(col1,col4,col5)','(double,float,float)',long
or:
sddscast APS.twi '-cast=col,(col1,col4,col5),(double,float,float),long'