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fileread, lun, array, start, num,
type
Reads raw data from a file opened on logical unit lun into
the array (whose prior contents are discarded), starting at
start position start in the file (measured in units of a
data value) and reading num data values. The data values
are assumed to be of the indicated type (as from
#type), and the array will be changed to that type.
If start is negative, then data is read from the current
position in the file.