Check zookeeper's IP registered on a hostname and returns its mode

check_zookeeper.sh

#!/usr/bin/env bash

if [ $# -ne 1 ]; then
    echo "usage: $0 <hostname>"
    echo "It show the mode the zookeepers are running"
    exit 1
fi
hosts=$(dig $1 +short | sort)
for host in $hosts; do
    echo -n "${host} -> "; echo stat | nc -w2 $host 2181 | grep Mode
    if [ $? -ne 0 ]; then
        echo KO
    fi
done