当我输入带空格的输入时，批处理 cmd 退出 [英] batch cmd exits as I enter the input with space

问题描述

我正在为一个用户界面编写一个批处理脚本，您可以在其中输入数字 1 - 10.它非常像这个例子:

<前>@回声关闭:问类回声按 1 为 test1回声按 2 为 test2设置/p 输入 =如果 %input% == 1 转到 test1如果 %input% == 2 转到 test2如果 %input% GTR 10 goto ask去问:test1关掉:test2网络视图暂停去问

我有 if %input% GTR 10 goto ask，最后 goto ask in global 因为如果有人输入不同的东西，它会回到问题.为什么当我输入不同的东西时它会导致我退出终端?

解决方案

如果你输入一个带空格的字符串，if 语法会给你一个语法错误.我们来看看:

if hello world == string echo xyz

if 语法为:if <比较器><值2>命令
所以 hello 是 value1，world 是比较器 - 等等 - 什么?world 不是比较器 - 语法错误.

将您的价值观括在引号中以确保安全:

if "hello world" == "string" echo xyz

所以 "hello world" 是 value1，== 是比较器，"string" 是 value2 和 echo xyz 是命令.一切顺利.

您可能对 choice 命令感兴趣，它自己进行错误处理并允许只有有效的密钥.

I am writing a batch script for an user interface where you can enter the digits 1 - 10. its pretty much like this example:

@echo OFF
:ask
cls
echo press 1 for test1
echo press 2 for test2
set /p input=
if %input% == 1 goto test1
if %input% == 2 goto test2
if %input% GTR 10 goto ask
goto ask
:test1
shutdown
:test2
net view
pause
goto ask

i have if %input% GTR 10 goto ask, and in the end goto ask in global because if someone types something different it will go back to the question. Why does it crash me out of the terminal when I type something different?

解决方案

if you enter a string with space(s), if syntax will give you a syntax error. Let's look at:

if hello world == string echo xyz

if syntax is: if <value1> <comparator> <value2> command
So hello is value1, world is the comparator - wait - what? world isn't a comparator - Syntax error.

Enclose your values in quoutes to be safe:

if "hello world" == "string" echo xyz

So "hello world" is value1, == is the comparator, "string" is value2 and echo xyz is the command. All goes well.

You may be interested in the choice command, which does it's own error handling and allows only valid keys.

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