users

while :
do
clear
echo "_________________________________________________________________________________________"
echo "|_______________________________________________________________________________________|"
echo "||_____________________________________________________________________________________||"
echo "|||                                                                                   |||"
echo "|||                                       USERS                                       |||"
echo "|||                                                                                   |||"
echo "|||      1. SHOW CONNECTED USERS                                                      |||"
echo "|||                                                                                   |||"
echo "|||      2. SEND MESSSAGE TO AN USER                                                  |||"
echo "|||                                                                                   |||"
echo "|||      9. RETURN                                                                    |||"
echo "|||                                                                                   |||"
echo "|||                                                                                   |||"
echo "|||                                                                                   |||"
echo "|||                                                                                   |||"
echo "|||                                                                                   |||"
echo "|||                                                                                   |||"
echo "|||                                                                                   |||"
echo "|||                                                                                   |||"
echo "|||                                                                                   |||"
echo "|||                                                                                   |||"
echo "|||                                                                                   |||"
echo "|||                                                                        0000___000 |||"
echo "|||      Please select desired option index                                00000__000 |||"
echo "|||                                                                        000_000000 |||"
echo "|||                                                                        000__00000 |||"
echo "|||                                                                        000___0000 |||"
echo "|||___________________________________________________________________________________|||"
echo "||_____________________________________________________________________________________||"
echo "|_______________________________________________________________________________________|"
read option
case $option in
1) echo "The users connected in the system are "; who -q;
   echo "Press ENTER to continue"; read nulo;;
2) echo "Type the recipient's name";
   read user;
   quantity=`who | grep -w $user | wc -l`;
   if test $quantity -gt 0
   then
        echo "Please, write your message and press ENTER to send"
        read message
        echo $message | mesg $user
        echo "Your message has been sent correctly"
   else
        echo "Error, the recipient $user is not connected"
   fi;
   sleep 2;;
9) sh menu; break;;
*) echo "Typing error"; sleep 1;;
esac
done