从文件中的所有行创建字符串并存储在变量[重复]中

您需要修改代码以添加 delayed expansion 对它来说:

@echo off
setlocal EnableDelayedExpansion

for /F "delims=" %%A in (filename.key) do set "content=!content! %%A"
rem Your other code here....:

但我会这样做:

@echo off
SETLOCAL EnableDelayedExpansion

set "content="

for /F "delims=" %%A in (./config/git/read.key) do (
    if defined content (
        set "content=!content!\n%%A"
    ) else (
        set "content=%%A"
    )
)

echo %content%

rem Your other code here....:

您可以选择您想要的方式。