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Assuming you're using bash (which you failed to mention), try
declare -A SRVFILES=([int]=intservers.txt [qa]=qaservers.txt [prod]=prodservers.txt)
read -p"Enter env: " ENV
Enter env: int
while...

You can try by removing the -v from rm and --verbose from xargs.

echo "Enter the Environment i.e int,qa,prod"
read env
case $env in
int)
Servers="Server1 Server2 Server3"
;;

qa)
Servers="Server4 Server5 Server6"
...