do
statement(s)
until booleanexpression
Execute the statement(s) inside the do loop whil the booleanexpression evaluates to false. Do / Until executes the statements one or more times. The test is done after each time the code in the loop is executed.
t = 1 do print t t = t + 1 until t > 5
will print
1 2 3 4 5
0.9.4g