Heres a case statement I wrote to check current users logged in,
what they are doing etc ...
[root@localhost Bash]# cat case.sh
echo "1 - Shows a listing of currently logged-in users "
echo "2 - Shows who is logged on and what they are doing "
echo "3 - Shows a list of last logged-in users, including login time,
logout time, login IP address, etc"
echo " 4 - Same as last, except that by default it shows a log of the
file /var/log/btmp, which contains all the bad login attempts."
echo " 5 - This reports data maintained in /var/log/lastlog,
which is a record of the last time a user logged in."
echo "6 - Exit Menu"
echo "Enter your Options "
case $e in
1) who ;;
2) w ;;
3) last ;;
4) lastb ;;
5) lastlog ;;
*) echo "$e Opps Option not available, Please choose between 1 to 5"
Save the file and exit