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I thought this would work:

$ lua
Lua 5.3.4  Copyright (C) 1994-2017, PUC-Rio
> term = io.popen('xterm -e "lua"',"w")
> term:write"Some Lua input\n"
file (0x1ef95f0)
> term:close()

After the first line, the new terminal appears. Encouraging.
After the second line, nothing changes on the terminal,
I thought it would pass my Lua input to it and run it.
After the third line, MY terminal dies. Ctrl-C brings it back,
killing the other terminal.

What I want to do is to make the other terminal execute
some Lua commands, as if I had been typing them in

Am I trying the impossible or missing the obvious?