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When using Orgmode, we can generate/export HTML file or TXT file from ORG file, using C-c C-e(or M-x org-export), as described in https://orgmode.org/manual/The-Export-Dispatcher.html.
I wonder if possible to generate them using shell commands? like emacs --eval org-export --target-file my-notes.org?
try...
emacs my-notes.org --batch -l my_init_file.el -f org-latex-export-to-pdf
-l option, that is emacs my-notes.org --batch -f org-latex-export-to-pdf, which is more adaptive.
--batch deliberately skips loading your init file, so if you have any customizations that you need for the export, you will have to use a -l some-init-file.el. But some-init-file.el can be much simpler than the full init.el that you use for your interactive sessions, which generally has a lot of stuff in it that is not relevant just for exporting an Org mode file to PDF.