Run lua from ingame or console

local runcmd = "eluna"
local function RunCommand(event, player, cmd)
    if (cmd:lower():find("^"..runcmd.." .+")) then
        -- Here you can define some environment variables for the code
        -- I defined plr to be the player or nil
        -- sel to be the current selection of the player or nil
        -- and print to be sendbroadcastmessage if the player is not nil
        local env = [[
            local plr = ...
            local sel = sel
            local pp = function(p, ...)
                local t = {...}
                for i = 1, select("#", ...) do t[i] = tostring(t[i]) end
                p:SendBroadcastMessage(table.concat(t, " "))
            end
            if (plr) then
                sel = plr:GetSelection()
            end
        ]]
        local code = env..cmd:sub(#runcmd+2)
        local func, err = load(code, "."..runcmd)
        if (func) then
            local res
            res, err = pcall(func, player)
            if (res) then
                return false
            end
        end
        print(err)
        if (not player) then
            print(err)
        else
            player:SendBroadcastMessage(err)
        end
        return false
    end
end

RegisterPlayerEvent(42, RunCommand)

-- Example usage:
-- Note that player doesnt exist if this is run from console, so I made it check for that. This command can be ran from console and ingame
-- .eluna print(GetLuaEngine(), plr and plr:GetName() or "console")
-- I defined pp to be a function to send a broadcast message to first passed player
-- sel is the selection of plr
-- .eluna pp(plr, plr:GetName(), sel and sel:GetName())