본문 : http://www.ischo.net -- 조인상 //시스템 엔지니어

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# vi /etc/profile  다음 script를 추가한다.
user=`echo $LOGNAME`
user_count=`who | grep $user | wc -l`
if ( $user_count > 2 ) then
echo "You have exceeded the max number of logins allowed
exit
fi