wait_tcp.sh

#!/bin/bash

abort() {
  echo $1
  exit 1
}

HOST=$1
PORT=$2
TIMEOUT=$3

if [[ "$TIMEOUT" == "" ]]; then
  TIMEOUT=60
fi

if [[ "$HOST" == "" ]]; then
  abort "HOST not provided"
fi

if [[ "$PORT" == "" ]]; then
  abort "PORT not provided"
fi

for i in $(seq 1 $TIMEOUT); do
  nc -z -w1 $HOST $PORT
  if [[ "$?" == "0" ]]; then
    exit 0
  fi
  echo .
  sleep 1
done

abort "timeout waiting for $HOST $PORT"

exit 1