批处理如何原样输出百分号(变量不扩展)

hothbo

请教一个很小白的问题

1. echo netsh i i show in>>temp.bat
   
2. echo ^@set /p idx=请输入“本地连接”的Idx编号：>>temp.bat
   
3. echo netsh interface ipv4 set dns name=^%idx^% static 192.168.1.230 >>temp.bat
   
4. echo netsh interface ipv4 add dns name=^%idx^% 192.168.1.223 index=2 >>temp.bat
   
5. echo ping 127.1 -n 3 >null>>temp.bat

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运行后的结果是：
netsh i i show in
@set /p idx=请输入“本地连接”的Idx编号：
netsh interface ipv4 set dns name= static 192.168.1.230
netsh interface ipv4 add dns name= 192.168.1.223 index=2
ping 127.1 -n 3

可是我需要的运行结果是：
netsh i i show in
@set /p idx=请输入“本地连接”的Idx编号：
netsh interface ipv4 set dns name=%idx% static 192.168.1.230
netsh interface ipv4 add dns name=%idx% 192.168.1.223 index=2
ping 127.1 -n 3

我单独把第三和第四句在dos下运行，运行结果是我需要的结果。可是为什么组合到一起却不是我想得到的结果？

ivor

☛☛☛☛

replace %idx% to %%idx%%

hothbo

回复 2# ivor


谢谢！！按照您说的运行结果达到预期效果了！

只是能否说明一下为什么要这样改么？

ivor

Escape Characters

1. Escape Characters
   
2. Character to be escaped        Escape Sequence        Remark
   
3. %        %%        May not always be required in doublequoted strings, just try
   
4. ^        ^^        May not always be required in doublequoted strings, but it won't hurt
   
5. &        ^&
   
6. <        ^<
   
7. >        ^>
   
8. |        ^|
   
9. '        ^'        Required only in the FOR /F "subject" (i.e. between the parenthesis), unless backq is used
   
10. `        ^`        Required only in the FOR /F "subject" (i.e. between the parenthesis), if backq is used
    
11. ,        ^,        Required only in the FOR /F "subject" (i.e. between the parenthesis), even in doublequoted strings
    
12. ;        ^;
    
13. =        ^=
    
14. (        ^(
    
15. )        ^)
    
16. !        ^^!        Required only when delayed variable expansion is active
    
17. "        ""        Required only inside the search pattern of FIND
    
18. \        \\        Required only inside the regex pattern of FINDSTR
    
19. [        \[
    
20. ]        \]
    
21. "        "
    
22. .        \.
    
23. *        \*
    
24. ?        \?

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hothbo

回复 4# ivor


    万分感谢！！！收藏之！