why won't this script work in my Edubuntu setup?

I had this script (below) which I used to use to
"kill" users quickly....I
even used to build other scripts from this one....such as
one that logged
off my kindergarten class...etc.  Problem is....it doesn't
work in my
current Edubuntu situation (with smbldap).  any idea why? 
What am I
missing?  I have the script in /usr/bin and the usage is

stop username 

used to work fine, but I know I'm missing something with
Edubuntu.  Here's
the script....(commented to avoid messing with your system) 
any ideas to
modify?

#   #!/bin/sh
#   # usage  stop username
#   # stop
#   # script to logoff a student
#   #

#   if [ $1 != "root" ]
#   then
#   for i in $(pgrep -u $1)
#   do
#      kill -9 $i
#   done
# else
#    clear
#    echo "Can't kill the root!!"
#  fi


David N. Trask
Technology Teacher/Director
Vassalboro Community School
dtraskvcsvikings.org
(207)923-3100



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