Running Programm in a sanbox

[JakobDev 0]

I'm searching something like the Computercraft function os.run(). I have found shell.execute, but this does not work for me.

--Code for the Programm who is running the sandbox
local shell = require("shell")
local sandta = {}

function sandta.print(text)
print("Print:"..text)
end

shell.execute("test",sandta)

--Code for the Programm who is sandboxed
print("Hello World!")

This works fine and print out Print:Hello World!. But if I changed the code of the sandboxed Programm to

local io = require("io")
print("Hello World!")
io.write("Another Text")

it does not print anything.  have anybody a solution for that?

[TYKUHN2 2]

How are you running the sandboxed program? Because I can guarantee one thing: require() is nil.