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March 13, 2024 21:24
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After downloading all emails from a folder in .eml format from ~~gmail~~ Thunderbird, format it such that every email is separated by a pipe (" | ") instead of a newline so that I can update the Gmail filter rule for new spam emails. Remember to check for false positives!
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| find . -type f -exec cat {} \; | nl | grep "From" | grep -o '[[:alnum:]+\.\_\-]*@[[:alnum:]+\.\_\-]*' | sort -fu | awk '{printf "%s | ",$0} END {print ""}' | rev | cut -c 4- | rev |
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