Joinc proposes educational computer-engineering contents. Especially, the contents focus on recently
popular and meaningful topics, technically helpful for those who already work or to-be developers in the
computer industry and theoretical or typical topics covered in undergraduate courses.
root 원격 접속 막기
특정 유저만 su를 수행 하도록
특정 명령 단위로 root 권한 획득
패스워드는 유추하기 힘들어야 한다