Shell Programming and Scripting

case $LOGNAME in
insp)
sl=20
sa=`who | grep $LOGNAME | wc -l`
if [ $sa -gt "$sl" ]
then
echo "you will be disconected.allready 2 sessions opened!"
sleep 4
exit
fi
;;
*)
sl=1
sa=`who | grep $LOGNAME | wc -l`
if [ $sa -gt "$sl" ]
then
echo "you will be disconected.allready one session opened!"
sleep 4
exit
fi
;;
esac

now, i have one user named insp wich can open till 20 sessions and onether 30 users wich username starts from "dist1" and goes to "dist30".
my problem is when "dist1" logs in , and then "dist11" or "dist12" trys to login, thay can't login. The script should limit every user to one session , but what happens is that when "dist1" logs in , then "dist11" can't , and when "dist2" logs in , "dist21" can't login anymore. it's not assuming a diference between "dist1" and "dist11" or "dist2" and "dist21".
Can someone help me to undestand what's wrong?
many thanks

The string "dist1" appears in "dist11" and "dist12" so they match and grep displays them. In the output of a "who" command, the user name will be followed by a space. So match for that:

grep "$LOGNAME "

Once again thanks Perderabo

That solved my problem