Shell Programming and Scripting

Hello all
i have simple script that executing program every 10 seconds
im invoke this script as daemon with second script that put it in the background
this is my first script (IsAliveTester.csh)

Code:

#!/bin/csh -f

@ iSleep = 10
set processName = "ClientTester"

while(1)

$processName

sleep $iSleep

end

-----------------
the secound script that invok the above script looks like this (RunIsAliveTester.csh ):

Code:

#!/bin/csh -f
IsAliveTester.csh &

----------------------------
now the third script suppose to kill the IsAliveTester.csh demon ( killIsAliveTester.csh )and it looks like this :

Code:

#!/bin/csh -f
@ pid = `ps -fu $USER | grep IsAliveTester.csh | grep -v grep | awk '{print $2}'`
kill -9 $pid

but the problem is when i run the killIsAliveTester.csh im getting the error :

Code:

`ps -fu $USER | grep IsAliveTester.csh | grep -v grep | awk '{print $2}'`: Ambiguous

when i run the onliner outside the csh its working great .

why im getting this error when running killIsAliveTester.csh