How to get the file size and delete file in Lua?

The size is given by myFile:seek("end").

To delete the file, use os.remove(path). But close the file first.

Recently Lua File System support was added to Corona! You can get file size using

local lfs = require "lfs"
local size = lfs.attributes (path, "size")

You can have a read here http://keplerproject.github.com/luafilesystem/manual.html#reference

To delete the file use

os.remove(path)