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I have now modified the eval command to evaluate and execute as a command any Polish notation expression given to it. If given an array, it treats it as multiple lines of code and executes all of it. Here is an example of its use:

eval join 'shift ' list ray a1 1 0;

Since quotation marks will mess up code entered as a move, here is an alternate version someone could type as a move:

eval join join shift ws list ray a1 1 0;

ws (also whitespace) is a new unary operator that returns a space character.

This will also work:

eval join join shift chr 32 list ray a1 1 0;