Question

我被困在一个部分，我不明白为什么，让我粘贴我的代码：

    local correctId=false
    echo $ticketMessage
    read deviceId

     until [[ $deviceId =~ [0-9]+ && correctId = true ]]; do

      if [ ! -e $baseDevicesPath"/$deviceId" ]; then
       echo $deviceError
       correctId=false
      else
       correctId=true
      fi

     if [[ ! $deviceId =~ [0-9]+ ]]; then
       echo $ticketMessage
     fi

      read deviceId
     done

    echo "I DONT COME HERE?"

如果deviceId和correctId都为真，它应该退出until循环并继续前进？但它没有，不知道我在这里做错了什么？

Answer 1

你只是有一个简单的拼写错误。在您的情况下，您在错误的ID前面缺少$：

local correctId=false
echo $ticketMessage
read deviceId

 until [[ $deviceId =~ [0-9]+ && $correctId = true ]]; do

  if [ ! -e $baseDevicesPath"/$deviceId" ]; then
   echo $deviceError
   correctId=false
  else
   correctId=true
  fi

 if [[ ! $deviceId =~ [0-9]+ ]]; then
   echo $ticketMessage
 fi

  read deviceId
 done

echo "NOW YOU WILL END HERE"

Answer 2

将correctId更改为$ correctId（$ {correctId}）。我会添加双引号：

local correctId="false"
echo ${ticketMessage}
read deviceId

until [[ $deviceId =~ [0-9]+ && "${correctId}" = "true" ]]; do

  if [ ! -e "${baseDevicesPath}/${deviceId}" ]; then
   echo ${deviceError}
   correctId="false"
  else
   correctId="true"
  fi

 if [[ ! "${deviceId}" =~ [0-9]+ ]]; then
   echo ${ticketMessage}
 fi

  read deviceId
 done

echo "Do you come here?"

Answer 3

这里有一个更易读的解决方案

function findDevice {
echo $ticketMessage;
read deviceId;

while true; do
    local errorMessage;
    if [[ $deviceId =~ [0-9]+ ]]; then
        if [ -e $baseDevicesPath"/$deviceId" ]; then
            #valid input, breaking the loop
            break;              
        fi
        errorMessage=$deviceError;
    else
        errorMessage=$ticketMessage;
    fi
    echo $errorMessage;
    read deviceId;
done
}

直到使用if语句循环

3 个答案: