키보드 입력 없이 ssh-keygen 생성하기

Automated ssh-keygen without passphrase, how?

http://unix.stackexchange.com/questions/69314/automated-ssh-keygen-without-passphrase-how

cat /dev/zero | ssh-keygen -t rsa -q -N ""

-q      Silence ssh-keygen.

[-N new_passphrase]