Wait for host up before doing stuff Shellscript | Linux

wait_for_host.sh

target_host='google.com'
interval=2

printf '\nWaiting for host %s' "${target_host}"
while true; do 
  if ping -c 2 -i .1 -W .5 ${target_host} > /dev/null; then
    printf '\rHost is %s up. Time to continue' "${target_host}"
    break
  fi
  
  ## time to wait 
  sleep ${interval:-2}
  printf '\rWaiting for host %s' "${target_host}"
done 


### Do stuff here

wait_for_host_curl.sh

# DST_PORT=443
# DST_PROTO='https'

http_response_ok='200'
target_host='google.com'
interval=2

printf '\nWaiting for host %s' "${target_host}"

while true; do
  curl_ret="$(curl -k -o -I -L -s -w "%{http_code}" ${DST_PROTO:-http}://localhost:${DST_PORT:-80})"

  if [ ${curl_ret} -eq ${http_response_ok:-200} ] ; then
    printf '\rHost is %s up. Time to continue\n' "${target_host}"
    break
  fi

  ## time to wait
  sleep ${interval:-2}
  printf '\rWaiting for host %s' "${target_host}"
done