add this script to your ~/.profile or ~/.loginpost ... dr.hrb.freeshell.org

[system@μ.*]

 trap "" 2 20 
 PS1="$"
 echo -e '\E[1;31;42m'"Additionally password protected.." 
 echo -e '\E[1;37;40m'" " 
 echo -e '\E[1;34;40m'"Enter Additional Password/Passphrase: " 
 echo -e '\E[0;37;40m'" " 
 read POTTYQ 
 if [ -z $POTTYQ ] 
 then 
 clear 
 echo "Additional Password failure!"
 echo "Please return again soon!"
 exit 
 fi 
 if [ $POTTYQ != "the magic passphrase" ] 
 then 
 clear 
 echo "Additional password failure.." 
 echo "..please return again soon." 
 exit 
 fi 
 clear 
 echo "Thank you, shell access activated!" 
 echo " "
 echo "© Hunter Reon Barnes"
 echo "888.919.7566"
 echo "http://dr.hrb.freeshell.org"