Interact is an [Expect] command which
"[[g]ives control of the current process to the user, so that keystrokes
are sent to the current process, and the stdout and stderr of the
current process are returned."
[http://webmail.cotse.com/dlf/man/expect/interact.htm]





Interact is quite amazing.  [[Elaborate]]


While there is [Expect for languages other than Tcl],
in the sense that a few other languages have extensions
that (partially) manage [pty]s and demand-response dialogues,
I know of no other that offers interact's functionality.