Obsidian Sync doesn’t copy dotfiles. .export-ignore needs to be added on every platform that you’re running obsidian-export.
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REBOL
Obsidian Export
A Rust library and CLI tool for exporting Obsidian vault contents into simpler Markdown more easily handled by static site generators or other processing scripts.
GitHub - zoni/obsidian-export: Rust library and CLI to export an Obsidian vault to regular Markdown
There’s curl-bash installation instructions corresponding to specific versions on the Releases page.