请问这个维护 hosts 文件的 bat 哪里写的不对?

自己喜欢折腾 hosts 文件,比如下面这是 Postman7 系列最终版屏蔽更新用的. 目前已经可以通过 PowerShell 可以正常维护 hosts 文件虽然 PowerShell 更方便语法也更简洁,但是需要额外执行一次 set-ExecutionPolicy RemoteSigned 才可以运行脚本感觉还是有点麻烦,所以还是折腾下 bat 脚本文件, 但是输出有问题但不知道出在哪

@echo off
setlocal enabledelayedexpansion
chcp 65001 > nul

:: 提权到管理员权限
net session >nul 2>&1
if %errorlevel% neq 0 (
    echo Requesting administrative privileges...
    powershell -Command "Start-Process '%~0' -Verb runAs"
    exit /B
)

:: 定义要添加的规则列表
set "rules[0]=127.0.0.1    dl.pstmn.io"
set "rules[1]=127.0.0.1    onboarding.postman.com"
set "rules[2]=127.0.0.1    analytics.getpostman.com"
set "rules[3]=127.0.0.1    assets.getpostman.com"
set "rules[4]=127.0.0.1    static.getpostman.com"
set "rules[5]=127.0.0.1    skills.gw.postman.com"
set "rules[6]=127.0.0.1    skills-assets.pstmn.io"
set "rules[7]=127.0.0.1    skills.getpostman.com"
set "rules[8]=127.0.0.1    config.getpostman.com"
set "rules[9]=127.0.0.1    cdn.postman.com"
set "rules[10]=127.0.0.1    getpostman.com"
set "rules[11]=127.0.0.1    www.postman.com"
set "rules[12]=#127.0.0.1   identity.getpostman.com"
set "rules[13]=#127.0.0.1   sync-v3.getpostman.com"


:: 设置 hosts 文件路径
set "hostsFile=%windir%\System32\drivers\etc\hosts"

:: 备份原始 hosts 文件
copy "%hostsFile%" "%hostsFile%.bak" >nul

:: 移除 hosts 文件的只读属性
attrib -R "%hostsFile%"
:: 读取每条规则并进行处理
for %%a in (0,1,13) do (
    set "line=!rules[%%a]!"
    echo Current: !line!
    :: 检查该规则是否已存在于 hosts 文件中
    findstr /C:"!line!" "%hostsFile%" >nul
    if errorlevel 1 (
        :: 如果未找到，则添加到 hosts 文件
        echo !line! >> "%hostsFile%"
        echo Added: !line!
    ) else (
        echo Skipped: !line! already exists
    )
)

:: 重新添加 hosts 文件的只读属性
attrib +R "%hostsFile%"

echo Done.
endlocal
pause

不知道为啥一共 13 条记录输出界面只打印下面 3 条,相应的 hosts 文件里也只出现了这三条, 百思不得其解, 求指教

Current: 127.0.0.1    dl.pstmn.io
Skipped: 127.0.0.1    dl.pstmn.io already exists
Current: 127.0.0.1    onboarding.postman.com
Skipped: 127.0.0.1    onboarding.postman.com already exists
Current: #127.0.0.1   sync-v3.getpostman.com
Skipped: #127.0.0.1   sync-v3.getpostman.com already exists
Done.
Press any key to continue . . .

bluforduwjldz1

3 天前

问题出在 for 循环的范围设置上。在您的代码中：

batch

复制
for %%a in (0,1,13) do
这行代码只会循环 3 次，分别处理索引 0 、1 和 13 的规则。在批处理中，这种写法不会遍历 0 到 13 之间的所有数字。

要遍历所有 13 条规则，您可以使用以下修改后的代码：
```bash
@echo off
setlocal enabledelayedexpansion
chcp 65001 > nul

:: 提权到管理员权限
net session >nul 2>&1
if %errorlevel% neq 0 (
echo Requesting administrative privileges...
powershell -Command "Start-Process '%~0' -Verb runAs"
exit /B
)

:: 定义要添加的规则列表
set "rules[0]=127.0.0.1 dl.pstmn.io"
set "rules[1]=127.0.0.1 onboarding.postman.com"
set "rules[2]=127.0.0.1 analytics.getpostman.com"
set "rules[3]=127.0.0.1 assets.getpostman.com"
set "rules[4]=127.0.0.1 static.getpostman.com"
set "rules[5]=127.0.0.1 skills.gw.postman.com"
set "rules[6]=127.0.0.1 skills-assets.pstmn.io"
set "rules[7]=127.0.0.1 skills.getpostman.com"
set "rules[8]=127.0.0.1 config.getpostman.com"
set "rules[9]=127.0.0.1 cdn.postman.com"
set "rules[10]=127.0.0.1 getpostman.com"
set "rules[11]=127.0.0.1 www.postman.com"
set "rules[12]=#127.0.0.1 identity.getpostman.com"
set "rules[13]=#127.0.0.1 sync-v3.getpostman.com"

:: 设置 hosts 文件路径
set "hostsFile=%windir%\System32\drivers\etc\hosts"

:: 备份原始 hosts 文件
copy "%hostsFile%" "%hostsFile%.bak" >nul

:: 移除 hosts 文件的只读属性
attrib -R "%hostsFile%"

:: 读取每条规则并进行处理
for /L %%a in (0,1,13) do (
set "line=!rules[%%a]!"
echo Current: !line!
:: 检查该规则是否已存在于 hosts 文件中
findstr /C:"!line!" "%hostsFile%" >nul
if errorlevel 1 (
:: 如果未找到，则添加到 hosts 文件
echo !line! >> "%hostsFile%"
echo Added: !line!
) else (
echo Skipped: !line! already exists
)
)

:: 重新添加 hosts 文件的只读属性
attrib +R "%hostsFile%"

echo Done.
endlocal
pause
```

主要修改是将：

```bash
for %%a in (0,1,13) do
```
修改为
```bash
for /L %%a in (0,1,13) do
```

使用 /L 参数后，格式为 (start,step,end)，这样会从 0 开始，每次加 1 ，一直到 13 ，从而处理所有的规则。这样修改后，脚本将会处理所有 14 条规则（索引 0 到 13 ）。