sort -u passwords.txt | while read -r password
do
    hash="$(printf '%s' "$password" |
        sha1sum |
        cut -d' ' -f1 |
        tr 'a-f' 'A-F')"
    printf '%sn' "$hash" >> hashes.txt
    printf '%st%sn' "$hash" "$password" >> passwords-with-hashes.txt
done

7z e -so pwned-passwords-sha1-ordered-by-hash-v*.7z |
cut -c 1-40 |
grep -Fxf hashes.txt |
tee matches.txt

grep -Ff matches.txt passwords-with-hashes.txt | cut -f2

shred --remove hashes.txt matches.txt passwords.txt passwords-with-hashes.txt