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lang-bash
exec < <(sleep infinity)in an interactive shell, you've got an interactive shell that is not very interactive. The shell would still consider itself interactive in that$-would still containi, but you might not. I'm not sure there's much more to discuss about it.interactive, it remains so. The fact that you could doset +iin older bash versions was a bug.bash, you'll probably find there's ainteractiveglobal boolean variable that maps to theiflag of$-. Changing that boolean will not automatically change all the behaviours of interactive shells. The changing from interactive to non-interactive is not supported.set +iand stops displaying a prompt. This is something that the user isn't supposed to do, so it isn't surprising that the behavior depends on the shell and is often accidental rather than the result of a deliberate decision by the shell implementer.