Update

local version = "1.50"  --change this to allow for an update (4 chars only)
local filename = "update"  --change this to the name of the file holding this program
local paste = "TKDQVfbj"  --change this to the pastebin entry code

local function update()
        local url = "http://pastebin.com/raw/"..paste
        local temp = http.get(url)
        local ver = string.sub(temp.readLine(), 18, 21)
        print(version..":"..ver)
        if ver ~= version then
                fs.delete(filename)
                shell.run("pastebin get "..paste.." "..filename)
                shell.run(filename)
                return true
        end
        return false
end

--end instance of previous version if updated
if update() then
    error()
end

--program code can go down here