What shell does the exec node call?

On my Raspberry pi, when I call OS commands via the exec mode, they seem to be executed in the Bash shell (which is good since /bin/sh is the slimline Dash shell).

Is /bin/bash invoked explicitly or is it just whichever shell Node-red was started from?
Or something else, a parameter maybe?

if on Linux and bash exists then yes it selects bash. If on Linux and bash not present I think it uses sh

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