check if command is not exist

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how do I check if a command that a player wrote is not exist? i want to do something like this:

if someone writing a command that not exist like akakaksl it will print him: "the command akakaksl is not exist".


thanks for helpers

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function isCommandExist(command)
	if command and type(command) == "string" then
		for _,cmd in pairs(getCommandHandlers()) do
			if cmd == command then
				return true
	return false

USAGE : isCommandExist(command)

Example : isCommandExist("say") then return true else return false end

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