Shell based Apache Tomcat agent

tomcat

#!/usr/bin/env sh
APP_VER="19.9.20"

version() {
    echo " Version $APP_VER \n"
}

help() {
    echo "\n Apache Tomcat Agent   version $APP_VER \n Copyright (c) 2019 Abhishek Kumar. All rights reserved."
    echo "\n Options:"
    echo "  -v --version    to see the current version of the app"
    echo "  -h --help       to see the menu of command line options"
    echo "\n Commands:"
    echo "  start           to start the tomcat server"
    echo "  restart         to restart the tomcat server"
    echo "  stop            to stop the tomcat server"
    echo "\n Please choose accordingly. \n"
}

if [[ "$1" == "" ]]; then 
    echo " Command missing! \n"
  else 
    cd $ROOT_DIR
	case "$1" in
    'start')
        echo " Start the tomcat server"
        $CATALINA_HOME/bin/catalina.sh start
    ;;
    'restart')
        echo " Restart the tomcat server"
        $CATALINA_HOME/bin/catalina.sh restart
    ;;
    'stop')
        echo " Stop the tomcat server"
        $CATALINA_HOME/bin/catalina.sh stop
    ;;
    '-v')
        version 
    ;;
    '--version')
        version
    ;;
    '-h')
        help
    ;;
    '--help')
        help
    ;;
    esac
fi
exit 0

$ tomcat -h

 Apache Tomcat Agent   version 19.9.20 
 Copyright (c) 2019 Abhishek Kumar. All rights reserved.

 Options:
  -v --version    to see the current version of the app
  -h --help       to see the menu of command line options

 Commands:
  start           to start the tomcat server
  restart         to restart the tomcat server
  stop            to stop the tomcat server

 Please choose accordingly.