[Freeswitch-users] how to run Lua commands in freeswitch?

[Samira Mh]

i have created the file named "helloworld.lua" like this:
session:answer();
session:streamFile("blah.wav");
session:hangup();
and it working correctly,
**now i want to use lua command -not freeswitch command -in lua 
for example run:

op='+'
if op == "+" then r = a + b elseif op == "-" then r = a - b elseif op == "*" then r = a*b elseif op == "/" then r = a/b else error("invalid operation") end
but how can do that?
thanks alot
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