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Am 10.10.2020 um 21:56 schrieb Sean Conner:
You can open a file for reading and writing by using "r+" for the mode when opening the file. The wording for "r+" in the Lua manual labels this mode as "update mode" (and in my opinion might not be clear about opening the file in read/write mode).
THIS was the golden tip! You saved my day. :) Thank You. Ulrich.