an intentionally very much cursed "one-liner" that returns the name of the bank of any given German IBAN number, without submitting the IBAN to any online service. It instead downloads the public BLZ list and checks against it offline

iban2bank.sh

echo "DE89 3704 0044 0532 0130 00" | { read iban; tmp=$(mktemp); url=$(curl -fsSL "https://www.bundesbank.de/de/aufgaben/unbarer-zahlungsverkehr/serviceangebot/bankleitzahlen/download-bankleitzahlen-602592" | grep -oP '(?<=href=")[^"]*blz-aktuell-txt-data\.txt' | head -1 | sed 's|^/|https://www.bundesbank.de/|'); curl -fsSL "$url" -o "$tmp" && awk -b -v blz="$(echo "$iban" | tr -d ' ' | cut -c5-12)" 'substr($0,1,8)==blz{print substr($0,10,58); exit}' "$tmp" | xargs; rm -f "$tmp"; }