有没有在Windows批处理脚本％之间1％1％的差异？ [英] Is there a difference between %1 and %1% in windows batch scripts?

问题描述

我amtrying理解％1 和％1％在批处理脚本，但无论哪种解释之间的差异在SO没有意义，是错误的，或者我有一个完整的误解或测试脚本无法正常工作给出。

I amtrying to understand the difference between %1 and %1% in batch scripts, but either the explanations given in SO do not make sense, are wrong, or I have a complete misunderstanding or the test script is working incorrectly.

在Windows 7中，我使用给出的剧本<一个href=\"http://social.technet.microsoft.com/Forums/scriptcenter/en-US/6b7d6b97-3b08-4b14-8b7e-77840fb02c2f/difference-between-1-and-1-in-batch-scripting?forum=ITCG\"相对=nofollow>这里：

On Windows 7 I am using the script given here:

@echo off
set Name=Amit
set 1=First
set 2=Second
echo My own environmental variables are:
echo Name=%Name%, 1=%1%, 2=%2%"
echo The user invoked this batch file with a parameter of %1

这给下面的输出：

which give the following output:

> tester.bat
My own environmental variables are:
Name=Amit, 1=2"
The user invoked this batch file with a parameter of .

和

> tester.bat test
My own environmental variables are:
Name=Amit, 1=test2"

我的结论：％1 和％1％是等价的。这是这样的吗？
    用户调用此批处理文件与测试的参数。

My conclusion: %1 and %1% are equivalent. Is this so? The user invoked this batch file with a parameter of test.

由于建议的foxidrive：

As suggested by foxidrive:

@echo off
echo %1% abc %2%
pause
echo %1 abc %2
pause

运行为 tester.bat AAA BBB 给第一个输出： aaa2 和第二输出 AAA ABC BBB 。

Run as tester.bat aaa bbb gives first output: aaa2 and second output aaa abc bbb.

推荐答案

是％1％是不正确的语法。

启动，像这样这个批处理文件，看看它是如何影响的脚本： file.bat AAA BBB

Launch this batch file like so to see how it can affect a script: file.bat aaa bbb

@echo off
echo %1% abc %2%
pause
echo %1 abc %2
pause

下面是控制台输出上面的：

Here is the console output for the above:

aaa2
Press any key to continue . . .
aaa abc bbb
Press any key to continue . . .

这是因为这个词％1％ABC％2％被解析为％1 结果
然后叫环境变量％ABC％这是不是在上述情况下的定义，结果
再加上 2 和一个孤独的％这将被丢弃。

This happens because the term %1% abc %2% is parsed as %1
and then an environment variable called % abc % which is not defined in the above scenario,
plus a 2 and a lone % which is discarded.

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