24일차 수업
#add #IP="$(echo $SSH_CONNECTION | cut -d " " -f 1)" #HOSTNAME=$(hostname) #NOW=$(date +"%e %b %Y, %a %r") #echo 'Someone from '$IP' logged into IP_223 '$HOSTNAME' on '$NOW'.' | mail -s 'SSH Login Notification' log@mail.jeonjucom.kr systemctl stop postfi