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by input_sh 2172 days ago
Not as simple as a bash script, but Obsidian (https://obsidian.md/) has this as a plugin.

Basically a button in the interface. You click on it and it creates a markdown file with today's date (example: YYYY-MM-DD). If one already exists, it just uses that one. You can also have a template that will be used when a new note is generated.