@echo off
setlocal enabledelayedexpansion
for /f "tokens=*" %%a in (a.txt) do (
    set var=%%a
    set change=!var:鸡^=7=鸡^=七!
    echo !change!
)
pause>nul
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@echo off
setlocal enabledelayedexpansion
for /f "tokens=*" %%a in (a.txt) do (
    set var=%%a
    set change=!var:"鸡=7"="鸡=七"!
    echo !change!
)
pause>nul 
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@echo off
setlocal enabledelayedexpansion
for /f "tokens=*" %%a in (a.txt) do (
    set var=%%a
    set change=!var:"鸡^=7"="鸡^=七"!
    echo !change!
)
pause>nul
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@echo off&setlocal enabledelayedexpansion
call :replace
for /f "delims=" %%a in (b.txt) do (
      set var=%%a
      set var=!var:鸡%char%7=鸡%char%七!&echo !var:%char%==!>>c.txt
)
pause&goto :eof 2>nul
:replace
set /p char=请输入一个文本中不包含的字符：
find /i "%char%" a.txt>nul&&goto replace
for /f "tokens=1* delims==" %%a in (a.txt) do (
    set temp=%%a%char%%%b
    call :loop
)
goto :eof 2>nul
:loop
for /f "tokens=1* delims==" %%m in ("!temp!") do (
        set temp=%%m%char%%%n
        if not "%%n"=="" (goto loop) else echo !temp:~0,-1!>>b.txt
)
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@echo off
mshta "javascript:var fso=new ActiveXObject('Scripting.FileSystemObject');fso.OpenTextFile('C:\\test\\b.txt',2,true).Write(fso.OpenTextFile('C:\\test\\a.txt').ReadAll().replace(/鸡=7/g, '鸡=七'));close()"
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sed -i "s/鸡=7/鸡=七/g" a.txt
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change a.txt /from "鸡=7" /to "鸡=七"
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wfr a.txt -r:"鸡=7" -t:"鸡=七"
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@echo off
setlocal enabledelayedexpansion
for /f "delims=" %%a in (a.txt) do (
  set var2=.
  set var=%%a
  if "!var:鸡=!" neq "!var!" set var2=
  if "!var:7=!" neq "!var!" set var2=
  if not defined var2 (
    set var=!var:"=[[q]]!
    set var=!var:鸡=" "鸡!
    for %%a in ("!var:7=7" "!") do (
      if %%a=="鸡=7" (set var2=!var2!鸡=七) else set var2=!var2!%%~a
    )
    echo !var2:[[q]]="!
  ) else echo;!var!
)

pause
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