Look at this example very carefully:
% echo "This is a really bad low entropy brain wallet" | bx base16-encode | bx sha256 | cut -c 1-64 | bx mnemonic-new | bx mnemonic-to-seed -p "sucks" | bx hd-new | bx hd-private -d -i 44 | bx hd-private -d -i 0 | bx hd-public -d -i 0 | bx hd-public -i 0 | bx hd-public -i 0 | bx hd-to-ec | bx ec-to-address -v 0
1Cs8vGgxaKpYWwSiubW5QziU5EAH8akTV3