[implemented] server jar package startup script and shell script

#!/bin/bash
# This can be replaced with your own execution program , The rest of the code doesn't need to change
APP_NAME=tmall.jar
LOG_NAME=tamll.log

# Instructions , Used to prompt for input parameters
usage() {
    echo "Usage: sh start.sh [start|stop|restart|status]"
    exit 1
}
# Check if the program is running
is_exist() {
    pid=`ps -ef | grep $APP_NAME | grep -v grep | awk '{print $2}' `
    # Returns if none exists 1, There is returned 0
    if [ -z "${pid}" ]; then
        return 1
    else
        return 0
    fi
}

# Starting method
start() {
    is_exist
    if [ $? -eq "0" ]; then
        echo "${APP_NAME} is already running. pid=${pid} ."
    else
        nohup java -jar /home/Tmall_demo/webapps/$APP_NAME > /home/Tmall_demo/logs/$LOG_NAME 2>&1 &
    fi
}

# Stop party
stop() {
    is_exist
    if [ $? -eq "0" ]; then
        kill -9 $pid
    else
        echo "${APP_NAME} is not running"
    fi
}

# Output running state
status() {
    is_exist
    if [ $? -eq "0" ]; then
        echo "${APP_NAME} is running. Pid is ${pid}"
    else
        echo "${APP_NAME} is not running."
    fi
}

# restart
restart() {
    stop
    start
}

# According to the input parameters , Select the corresponding method to execute , Without input, the instructions are executed
case "$1" in
    "start")
        start
        ;;
    "stop")
        stop
        ;;
    "status")
        status
        ;;
    "restart")
        restart
        ;;
    *)
        usage
        ;;
esac