Reads tab delimited fields from opened data
file into the variable(s) named. Fields
length is limited to 255, but record length
is unlimited.
If command contains more variables than the
record, the remaining variables are set to
empty strings.
If there are remaining fields in the record
after all Vars are used, the remaining fields
are discarded, unless the last variable is
followed by a comma.
Examples:
.rt A,B,C,D
Above reads in the first 4 variables from the
first record, then discards the remainder of
any remaining fields in that record.
.rt A,B,C,D,
Above reads in the first 4 variables from the
first record without discarding the remainder
of any remaining fields in that record. The
next .RT command will start reading the 5th
field in the record.