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Convert .gitignore files in a repo into a dockerignore file
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| git ls-files --recurse-submodules --full-name |\ | |
| awk -F/ '($(NF) == ".gitignore")' |\ | |
| xargs -I{} awk -vx="{}" 'BEGIN{gsub(/[.]gitignore$/,"", x)}/^ *#/{print;next}/./{print x$0}' "{}" |\ | |
| awk 'BEGIN{print ".git"}{print}' |
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