CrLf

@(for /f "delims=" %%a in (a.txt)do echo;&for %%b in (%%a)do set/p=%%b)<nul>b.txt
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%1 @cmd /q /v /c"for /f "delims^=" %%a in (a.txt)do set str=%%a&(for /l %%b in (-9 1)do set str=!str:  = !)&echo !str: =,!"
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手机不便，怎么短怎么写，不考虑可读性…