At least two ways to load a file:
unix > rex
rex > *i
test.rex
read file test.rex
rex > x;
[3, 9, 1, 2, 8, 7, 5, 6, 4]
rex > y;
[barley, beans, oats, peas]
rex > z;
[[1, 2], [3, 4], [5, 6]]
Method 2:
Include the file from a rex command line
here