What is that?

Lua has a thing called "os.execute", which can make things like interact with the user's command prompt, example:

function onCreatePost()
	os.execute('echo Wait... & echo Takes around 12 seconds. & pip install pywin32 & pip install ctypes & pip install time & pip install math')
	end

Example of Python code using "os.execute"

function onCreatePost()
	os.execute('python sample.py') --execute an pre-existing file
	end

Examples

This seems like just an random lua command, but it can basically make anything. Example of an simple message box system:

mesage.bat (./TESTS)

:: MessageBox System, make [ONLY](/JordanSantiagoYT/FNF-JS-Engine/wiki/ONLY) for Imaturidade++
:: By: PatoFlamejanteTV, made ONLY by me
:: ----------------------------------------------------------------------------------
@echo off
IF EXIST temp.vbs (
    del temp.vbs
)
echo x=msgbox("%1" ,%3, "%2") >> temp.vbs
start temp.vbs
echo DEBUG: Message: %1, Title: %2.
:: del temp.vbs
:: message.bat Die ? 48
:: ^ .bat Name ^   ^  ^- Icon and Other Stuff (eg. "48 for Warning Message icon")
::             |   |- Title (eg. "...")
::             |- Content/Message/Text (eg. "I-N-F-E-C-T-E-D")

script.lua (./data/song)

function onCreatePost()
	os.execute("cd .. & cd .. & cd TESTS & message.bat Muahahaah ? 48")
	end

Compatibility

This works on basically any engine that supports lua, this includes forks of JS Engine and Psych Engine.

Remember: SOME ENGINES MAY DISABLE (for some reason) THIS, SO IT IS NOT GUARANTEED!!!