Using 'su' inside a loop

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# 1  
Using 'su' inside a loop

I am using su within a for loop. As you might expect, it prompts for password during each loop execution. Here is my piece of code:
for i in $LIST
  if [ `echo $i | grep -c 'APSTAGE'` -gt 0 ]
    DATABASE=`echo $i | awk -F "|" '{ print $1 }'`
    USER_ID=`echo $i | awk -F "|" '{ print $2 }'`
    su - apstage -c "echo $i; cd /home/apstage/src/util; . GHD_common.ksh; db_connect -c $DATABASE -u $USER_ID"

I tried to put the loop inside su -c but $LIST, defined in the script is not visible after su gets executed.

How can we provide password automatically during each loop execution. Any idea?
# 2  
By using sudo with NOPASSWD set for the apstage command. Everything else is, at best, complicated, and completely and utterly insecure.
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