For (loop)
Exec a script on a 10 servers batch, pause and continue the loop following this scheme
i=1
for h in server{1..1000}; do
ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no $h "screen -dmS my_script /tmp/scripts/my_script.sh"
if (( i % 10 == 0 )); then # Pause 25mns every 10 iterations.
sleep 1500
fi
let "i++"
done