How can I make it so that it saves changes to a specific file, and not writes it over again?

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node_js_developer_20192021-09-07 00:10:01

Node.js

node_js_developer_2019, 2021-09-07 00:10:01

How can I make it so that it saves changes to a specific file, and not writes it over again?

In general, I wanted to try to make users according to different files, and now I got stuck on saving, it seems to be recording, but creating on a new one, how can I make it so that it saves changes, and not writes on a new one

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