How to create a loop in bash that is waiting for a webserver to respond?

Question

How to create a loop in bash that is waiting for a webserver to respond?

It should print a \".\" every 10 seconds or so, and wait until the server starts to respond.

Answer 1

Interesting puzzle. If you have no access or async api with your client, you can try grepping your tcp sockets like this:

until grep '***IPV4 ADDRESS OF SERVER IN REVERSE HEX***' /proc/net/tcp
do
  printf '.'
  sleep 1
done

But that's a busy wait with 1 sec intervals. You probably want more resolution than that. Also this is global. If another connection is made to that server, your results are invalid.