lua_copy[-0, +0, –] void lua_copy (lua_State *L, int fromidx, int toidx); Copies the element at index

lua_pushvfstring[-0, +1, m] const char *lua_pushvfstring (lua_State *L, const

io.read (···) Equivalent to io.input():read(···).

debug.getuservalue (u) Returns the Lua value associated to u. If u is not a full userdata, returns nil.

string.rep (s, n [, sep])nssepsepn (Note that it is very easy to exhaust the memory of your machine with a single

luaL_optnumber[-0, +0, v] lua_Number luaL_optnumber (lua_State *L, int arg, lua_Number d); If

string.upper (s)

io.popen (prog [, mode]) This function is system dependent and is not available on all platforms. Starts program prog in a separated process and returns

utf8.len (s [, i [, j]])sijij

utf8.char (···)