Hi,
I found in README of inferior-shell, it is said that the default output mode is as follow:
NIL (default) for inheriting the parent process's stdout,
But in recent uiop implementation, the ":output nil" means to redirect to /dev/null, while ":output :interactive" means to inherate the parent process's stdout (at least for sbcl).
So I think we should change the default value of output parameter for run or change the README.