One-Liners

rat run py 'x = 42; print(x)'

42

Any language

rat run sh 'ls -la'

rat run r 'summary(mtcars)'

Shared state

One-liners run in the same kernel as the REPL. Variables persist:

rat run py 'x = 42'

rat run py 'print(x + 1)'

43

The kernel auto-starts if it isn’t running.