RabbitMQ Upgrade - Bash Script

An easy to read, trivial bash script for upgrading RabbitMQ service.

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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