mark@snode3:~/.z.lua$ lua ~/.z.lua/z.lua --init bashZLUA_SCRIPT="/home/mark/.z.lua/z.lua"lua: /home/mark/.z.lua/z.lua:514: attempt to concatenate a nil value (local 'path')stack traceback:        /home/mark/.z.lua/z.lua:514: in function </home/mark/.z.lua/z.lua:496>        (...tail calls...)        /home/mark/.z.lua/z.lua:2347: in function 'z_shell_init'        /home/mark/.z.lua/z.lua:2010: in function 'main'        /home/mark/.z.lua/z.lua:2856: in main chunk        [C]: in ?mark@snode3:~/.z.lua$ lua -vLua 5.3.3  Copyright (C) 1994-2016 Lua.org, PUC-Rio