Bonne idée d’utiliser l’option -r pour "append". Je n’y aurais pas pensé.
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Want to find all *.py files and create a tarball on a Linux/Unix/macos? Try
find ~ -name "*.py" -exec tar -rvf ~/all-python-files.tar "{}" \;
https://www.cyberciti.biz/faq/linux-unix-find-tar-files-into-tarball-command/
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