将脚本保存为 app.sh，执行 sh app.sh a.jar 命令即可启动 a.jar 程序。

!/bin/bash

# App Info
# 应用存放地址
APP_HOME=/opt/02-etax/8003/code
# 应用名称
APP_NAME=$1

# Shell Info

# 使用说明，用来提示输入参数
usage() {
        echo "Usage: sh boot [APP_NAME] [start|stop|restart|status]"
        exit 1
}

# 检查程序是否在运行
is_exist() {
        # 获取PID
        PID=$(ps -ef | grep ${APP_NAME} | grep -v $0 | grep -v grep | awk '{print $2}')
        # -z "${pid}"判断pid是否存在，如果不存在返回1，存在返回0
        if [ -z "${PID}" ]; then
                # 如果进程不存在返回1
                return 1
        else
                # 进程存在返回0
                return 0
        fi
}

# 定义启动程序函数
start() {
        is_exist
        if [ $? -eq "0" ]; then
                echo "${APP_NAME} is already running, PID=${PID}"
        else
                nohup java -jar -Xms512m -Xmx1024m ${APP_HOME}/${APP_NAME} >/dev/null 2>&1 &
                PID=$(echo $!)
                echo "${APP_NAME} start success, PID=$!"
        fi
}

# 停止进程函数
stop() {
        is_exist
        if [ $? -eq "0" ]; then
                kill -9 ${PID}
                echo "${APP_NAME} process stop, PID=${PID}"
        else
                echo "There is no process of ${APP_NAME}"
        fi
}

# 重启进程函数
restart() {
        stop
        sleep 2
        start
}

# 查看进程状态
status() {
        is_exist
        if [ $? -eq "0" ]; then
                echo "${APP_NAME} is running, PID=${PID}"
        else
                echo "There is no process of ${APP_NAME}"
        fi
}

case $2 in
"start")
        start
        ;;
"stop")
        stop
        ;;
"restart")
        restart
        ;;
"status")
        status
        ;;
*)
        usage
        ;;
esac

exit 0