To restrict multiple logins, place the following lines in the users .profile

# Limit number of logins allowed 
Times_allowed=2
Time_in=`who | grep $LOGNAME | wc -l` 
if [ $Time_in -gt "$Times_allowed" ] 
then 
  echo "$LOGNAME is already logged in $Times_allowed times!"
  exit 
  exec /bin/login 
fi

Then chmod 444 and chown root .profile

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