Question

我的Bash脚本存在问题，脚本本身工作正常，但我正在尝试整理它，但我找不到/想到一个方法作为＆＃34; goto＆＃34;命令，是的，我是Linux Bash的新手。

我的代码是：

echo "What is the street road?"
read road
echo "What is the address ?"
read address
echo "User is set as: $road"
echo "Address has been set as: $address"


while true; do
    read -p "Is this correct? " yn
    case $yn in
        [Yy]* )  break;;
        [Nn]* )  exit;;
        * ) break;;
    esac
done

当用户输入＆＃34; n＆＃34;该脚本将退出自己，但我正在尝试整理它，所以它只会在这里重新循环。因此，如果用户输入＆＃34; n＆＃34;它会再次重新询问他们的道路和地址。

我知道.bat你可以做到：一个转到：A （或类似的东西！）但在Bash我不知道该怎么做？

谢谢大家！

Answer 1

我建议你在GNU bash中使用它：

#!/bin/bash

until [[ $yn =~ ^[Yy]$ ]]; do
   read -p "What is the street road? " road
   read -p "What is the address ? " address

   echo "User is set as: $road"
   echo "Address has been set as: $address"

   read -p "Is this correct? " yn
done

# continue with your code here

Answer 2

我会像这样重写你的剧本：

ask () {
    echo "$1"
    read answer

    while true; do
        read -p "Is this correct? " yn
        case $yn in
            [Yy]* )  break;;
            [Nn]* )  exit;;
            * ) break;;
        esac
    done

    eval "$2='$answer'"
}

ask "What is your street?" street
ask "What is the address?" address
echo "Your address has been set to $address $street"

就像我在您对您的问题的评论中提到的那样，在任何语言中使用goto通常被视为不良格式（因为它导致难以调试的代码，除了非常具体情况），bash does not have a goto like you find in other languages无论如何。如果您发现自己编写的代码需要goto，请花一点时间，从键盘向后倾斜，然后重新评估一下您的前提。 99.999％的时间，你会发现你并不真正需要它，并且有一种结构化的编程方法可以更加巧妙地完成同样的事情。

Answer 3

你可以激进：

ok=no
while   read -p "What is the street road? " road &&
        read -p "What is the address? " address &&
        echo "Road is set to: $road" &&
        echo "Address has been set as: $address" &&
        read -p "Is this correct? " yn
do
    case $yn in
    ([Yy]*) echo "Great!"; ok=yes; break;;
    ([Nn]*) echo "OK - then try again";;
    (*)     echo "Didn't understand that - it did not look like Y or N";;
    esac
done

if [ "$ok" = "yes" ]
then : OK to use answers
else : Do not use answers
fi

这利用了这样一个事实，即您可以将任意命令列表作为条件＆＃39;在while循环中。我已将这些命令与&&一起链接，因此它们都必须成功，但您可以拥有独立的命令，在这种情况下，最后一个是重要的命令。我还利用read -p 'prompt' var符号表示初始值以及“这是正确的”＃39;之一。

示例对话：

$ bash prompt.sh
What is the street road? California
What is the address? 1189
Road is set to: California
Address has been set as: 1189
Is this correct? n
OK - then try again
What is the street road? California Ave
What is the address? 2291
Road is set to: California Ave
Address has been set as: 2291
Is this correct? y
Great!
$

Answer 4

有点不典型，但你可以这样做：

#!/bin/sh
while
    read -p 'What is the street road? ' road
    read -p 'What is the address ? ' address
    echo "User is set as: $road"
    echo "Address has been set as: $address"
    read -p "Is this correct? " yn
    case $yn in
        [Yy]* )  false;;
        * )  true;;
    esac
do
    :
done
echo "User is set as: $road"
echo "Address has been set as: $address"

Linux Bash goto命令？

4 个答案: