交互式shell脚本编程1

1. 简单模板

choose_environment() {
    # 重新选择
    reselect=${1}
    if [ $reselect == 0 ];then
        echo '请选择要操作的环境: '
    elif [ $$reselect == 1 ];then
        echo '请重新选择要操作的环境: '
	fi
    echo '1.开发环境'
    echo '2.测试环境'
	echo 'q.结束'
	# 获取用户的输入
    read -p '请输入序号, 选择环境: ' -n 1 environmentnum
	echo '\n'
	# 这里注意,判断空必须加双引号,双引号识别为没有内容;主要处理没有输入指令直接回车
	if [ -z "$environmentnum" ];then
		choose_environment 0
    elif [ $environmentnum == 1 ];then
        echo '进入开发环境操作'
    elif [ $environmentnum == 2 ];then
        echo '进入测试环境操作'
	elif [ $environmentnum == 'q' ];then
		echo '欢迎再次使用'
		# 结束脚本执行
		exit 1
    else 
        echo '不支持的序号'
		echo $environmentnum
		choose_environment 1
    fi
}

choose_environment 0

上面部分代码写了注释:

  1. reselect: 是接受传递进来的第一个参数的变量;通过 ${数字} 的语法去接受参数;
  2. if, elif, else, fi: 是流程控制指令; [ $reselect == 0 ] 是用来做判断;在脚本中使用变量,要使用 $ 变量名的方式; 判断语句必须和中括号之间存在一个空格;
    == 是做值判断; 分号是判断语句结束标志; [ -z “$environmentnum” ] 这里的 -z 是判断变量值是否为空; then 后面跟进入判断语句的执行内容; fi 是流程控制语句的结束标志,在一个流程控制中必须存在,和 if 成对出现;
  3. echo一般是做内容输出到命令行;
  4. (read -p '请输入序号, 选择环境: ’ -n 1 environmentnum): read 是用来读取用户在命令行的输入;
    -p 后面跟的是提示文案;
    -n 后面跟的是限定输入字符个数; environmentnum 是用来接受用户在命令行输入的内容
  5. choose_environment choose_environment(): 是定义的函数 choose_environment 0: 是调用函数代码,其中 0 是第一个传递参数的值;

2. 使用用例

OPTION=$(whiptail --title "zhaoshuangjian Menu Dialog" --menu "Choose your option" 15 60 4 \
"1" "restart zookeeper" \
"2" "manager kill-tar-start" \
"3" "预留" \
"4" "预留"  3>&1 1>&2 2>&3)




managerpath=/home/zhaosj/dsp/
managerfolder="$managerpath/tongdsp.manager-3.1.0/"
zookeeperpath=/home/zhaosj/zookeeper01/bin/
exitstatus=$?
if [ $exitstatus = 0 ]; then

  if [[ $OPTION = 1 ]]; then
    
    # 查询进程
    # process=`ps -ef | grep "zookeeper01" | grep -v grep | awk '{print $2}'`

    # 如果进程存在,则结束该进程
    # if [[ -n "$process" ]]; then
    #   echo "zookeeper process id is $process"
    #   kill $process
    # fi

    # 启动zookeeper
    $zookeeperpath/zkServer.sh restart

    # 查询进程
    process=`ps -ef | grep "zookeeper01" | grep -v grep | awk '{print $2}'`

    # 如果进程存在,说明启动成功
    if [[ -n "$process" ]]; then
      # zookeeper启动成功
      echo "zookeeper $process process is running !"
    else
      # zookeeper启动失败
      echo "zookeeper $process process is fail !"
    fi


  elif [ $OPTION == 2 ];then

    if [[ -d "$managerfolder" ]]; then

      # stop manager process
      sh "$managerfolder/bin/shutdown.sh"

      # delete manager folder
      rm -rf "$managerfolder"

      # tar manager folder
      tar -zxvf "$managerpath/tongdsp.manager-3.1.0.tar.gz"

      # copy license.dat
      cp -r "$managerpath/license.dat" "$managerfolder"

      # start manager  process
      sh "$managerfolder/bin/startup.sh"

      # 查询manager进程
      process=`ps -ef|grep "tongdsp.manager-3.1.0"|grep -v grep | awk '{print $2}'`
      # 如果进程存在,说明启动成功
      if [[ -n "$process" ]]; then
        # manager启动成功
        echo "manager $process process is running !"
      else
        # manager启动失败
        echo "manager $process process is fail !"
      fi
    fi

  fi

else
    echo "You chose Cancel."
fi```

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