SOLVED: Writing value of input_number to a text file

At the end of each month, my input_number value gets reset to 0. Before its reset, I’d like to write its current value to a txt file for historical purposes. I searched HA and found something about SHELL commands, but I couldent find definitive examples.

So in my flow, I’d place something to do this between the Big Timer node and the ‘Reset Monthly to 0’ node. I just don’t know what.

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If anyone is wondering about solution, see this thread: