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lang-bash
iin the value of $-" is the definition of shell interactiveness, and thus it is the source of truth. Then the first answer to "where is it stored" would be in$-and the answer to "can a shell become interactive or vice versa" is yes, clearly. Now that simplifies your questions but then makes the definition of "interactive" more complex. But beyond the implications in the shell itself, maybe its definition is simply intent. Processes invoked by a (non)interactive shell should attempt to respect that intent though it may not be technically enforced.$-? How are we supposed to know that intent from a non-shell program? Is that stored in a flag somewhere on the process?