It's a hack, but since both Nelgin *and* Mortifis asked for it...
If a string variable is defined in the current command-shell, you may display
that variable's current value using this @-code. This does not work for integer
variables (do you need that too?) and does not work for any other Baja modules
that are executed (e.g. executed *from* a command shell).
Note that Baja, by defaults converts variables names to all-CAPS during the
"compilation" phase (unless the "baja -c" option is used), so you'll want to
either specify the variable name in ALL-CAPS or (if "baja -c" was used), match
the capitalization used in the .src file.