[Fizzlemizz]

The function for a slash command receives a single string parameter. If you want to interpret that into say commmands and parameters, you need to break down the string that is passed eg:

SlashCmdList.SLASHFUNC = function(msg)
    local command, p1, p2, p3, p4 = strsplit(" ", strupper(msg))
    if command == "RESET" then
        FCF_ResetChatWindows()
    elseif command == "LEAVE" then
        if p1 == "TRADE" then
            LeaveChannelByName("Trade")
        else
            print(command, p1, "Not Implemented!")
        end
    end
end
 
-- test
SlashCmdList.SLASHFUNC = function("leave trade")

or are you saying you want to test if RunScript(strLine) is going to run without error before running RunScript(strLine)?