Batcher

# 方法1.bat

@echo off
cd /d "%~dp0"
set "OldFile=1.txt"
set "NewFile=2.txt"
>"%temp%\BOM.tmp" echo 77u/
certutil -decode -f "%temp%\BOM.tmp" "%NewFile%" >nul
>>"%NewFile%" type "%OldFile%"
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# 方法2.bat

@echo off
cd /d "%~dp0"
set "OldFile=1.txt"
set "NewFile=2.txt"
powershell "[System.IO.File]::WriteAllBytes('%NewFile%',[byte[]](239,187,191)+[System.IO.File]::ReadAllBytes('%OldFile%'))"
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# 方法3.bat
http://bcn.bathome.net/s/tool/index.html?key=sed

@echo off
cd /d "%~dp0"
set "OldFile=1.txt"
set "NewFile=2.txt"
sed.exe "1s/^/\xEF\xBB\xBF/" "%OldFile%" > "%NewFile%"
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