Trivial bash script for upgrading RabbitMQ service

rabbitmq.sh

function check_rmq_version {
    rmq_version=$(sudo rabbitmqctl status | grep "rabbit," | cut -d',' -f3 | cut -d'}' -f1 | tr -d '"')
    echo && echo "    Version = $rmq_version" && echo
}

function stop_rmq {
    echo "Stopping RabbitMQ..."
    sudo service rabbitmq-server stop
}

function kill_erlang {
    echo "Killing stray RMQ/erlang processes..."
    #pids=$(ps -fe | grep erlang | grep rabbitmq | awk '{ print $2 }')
    #echo $pids
    pgrep -u rabbitmq -x beam | xargs kill -9 || echo && echo "    RabbitMQ already stopped"
    echo
}

function upgrade_rmq_version {
    echo "Changing directory to /tmp..."
    cd /tmp
    echo

    echo "wgetting RabbitMQ .rpm file from official website..."
    url="http://www.rabbitmq.com/releases/rabbitmq-server/v3.4.3/rabbitmq-server-3.4.3-1.noarch.rpm"
    wget $url
    echo

    echo "Validating signature..."
    url="http://www.rabbitmq.com/rabbitmq-signing-key-public.asc"
    sudo rpm --import $url
    echo

    echo "Upgrading RabbitMQ version..."
    file="rabbitmq-server-3.4.3-1.noarch.rpm"
    sudo yum install $file
    echo
}

function start_rmq {
    echo "Starting RabbitMQ"
    sudo service rabbitmq-server start
}

function main {
    check_rmq_version   # Checking the current version of RabbitMQ
    stop_rmq            # Stopping the rabbitmq-server service
    kill_erlang         # Killing erlang to ensure RMQ is stopped
    upgrade_rmq_version # Upgrading RabbitMQ
    start_rmq           # Starting the rabbitmq-server service
    check_rmq_version   # Checking the current version of RabbitMQ
}

main