[Lua][Question] How Can I Get the Return Statement's Value From Another Program?

If I have a program called "return", with code like:

return 100

How can I get 100 from this program in a different program?

I tried:

shell.run("return")

print(shell.run("return"))

a, b, c = shell.run("return"))
print(a, b, c)

And I couldn't get 100 from any of them. I have absolutely no clue how to do it, as it doesn't work like any other programming language I've ever dealt with.

The command you are looking for is loadfile(). Check it out in the lua documentation here and here. Something like this should work:

a = assert(loadfile("return"))()

dotsonface, on 17 June 2012 - 06:00 AM said:

Hmm… try this code:

Return Program:

return_code = 100

Actual Program:

shell.run("return")
if return_code == nil then
print("This test has failed.")
else
print("Success!")
print(return_code)
end

Perfect. Thanks!

Is there no other way to get return values from a program called form another program?
Cause i dont want to use global variables.

I want to call a program with args and get a return value back.

Someone got an idea?

diosmio, on 02 February 2013 - 08:09 AM said:

Is there no other way to get return values from a program called form another program?
Cause i dont want to use global variables.

I want to call a program with args and get a return value back.

Someone got an idea?

As stated by kazagistar, you can use loadfile().

There's also dofile(). The difference between the two is that loadfile() returns a function with the program's code, while dofile() immediately runs it.

Yes. It works with:

returnvalue = assert(loadfile("programname"))("argument")

thx very much