The file ipupdate.txt should look like this:

ip.ip.ip.ip ctid

while read -r; do
ip=$REPLY
setip=`echo $ip|awk '{print $1}'`
ctid=`echo $ip|awk '{print $2}'`
echo "vzctl set $ctid --ipadd $setip --save"
vzctl set $ctid --ipadd $setip --save
done < ipupdate.txt

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