main.lua

-- https://github.com/Planebagels/command-script
local VER_ = "cmd script version alpha 1.1.8"

function DispDefualtMsg()
	print(VER_)
end

DispDefualtMsg()

local function wait (cmdSleepGetNum) -- you can name this function
-- whatever you want, it doesn't matter.
  local start = os.time ()
  repeat until os.time () > start + cmdSleepGetNum
end

local commands = {

	ghublnk = function ()
		print("https://github.com/Planebagels/command-script")
	end,
	luaver = function ()
		print("you are using Lua version:",_VERSION,"!\n")-- _VERSION holds what version
		-- of lua you are using.
	end,
	ver = function ()
		print(VER_)
	end,
	console = function (arg)
		MainLoop = false
	end,
	clr = function (arg)
		print"are you a unix user? Y or N"
		arg = io.read()
			
	if arg == "y" or "Y" then
		os.execute("clear")
		DispDefualtMsg()
	elseif arg == "n" or "N" then
		os.execute("cls")
		DispDefualtMsg()
		end
	end,
	div = function (arg, arg2)
		arg = tonumber( io.read() )
		arg2 = tonumber( io.read() )		
		local div_ = arg / arg2
		print(div)
	end,
	multiply = function (arg, arg2)
		arg = tonumber( io.read() )
		arg2 = tonumber( io.read() )
		local product = arg * arg2
		print(product)
	end,
		
	subtract = function (arg, arg2)
		arg = tonumber( io.read() )
		arg2 = tonumber( io.read() )
		local diff = arg - arg2
		print(diff)
	end,
		add = function (arg, arg2)
		arg = tonumber( io.read() )
		arg2 = tonumber( io.read() )
		sum = arg + arg2
		print(sum)
	end,
   	help = function ()
       	 print "you'll find it out"
    	end,
   	 say = function (arg)
        	if arg == '' then
          	  print 'what do you want to say?'
            	arg = io.read ()
        end
print (arg)
end,
    stop = function ()
        os.exit ()
    end,
    sleep = function (arg)
        if arg == '' then
            print 'how long?'
            arg = tonumber (io.read ())
        end
        wait (tonumber (arg))
    end,
    rand = function ()      
        local randNum = math.random ()
        print (randNum)
    end,
    [false] = function ()   -- fallback.
        print 'Unknown command'
    end
}

MainLoop = true

-- Main loop:
while MainLoop do
    io.write '> '
    local key, _, arg ,arg2 = io.read ():match '^%s*/(%S+)(%s*(.*))$' -- you can type /sleep 1, etc. in one line.
    local command = key and key ~= '' and commands [key] or commands [false]
    command (arg, arg2)

end