Доработка. С поддержкой транслитерации файлов.
translator.bat
@echo off
if "%*"=="" goto :eof
if not exist %1 goto istext
setlocal enabledelayedexpansion
for /f "delims=" %%a in (%1) do (
set words=%%a
set words=!words:а=a!
set words=!words:б=b!
set words=!words:в=v!
set words=!words:г=g!
set words=!words:д=d!
set words=!words:е=e!
set words=!words:ё=jo!
set words=!words:ж=zh!
set words=!words:з=z!
set words=!words:и=i!
set words=!words:й=j!
set words=!words:к=k!
set words=!words:л=l!
set words=!words:м=m!
set words=!words:н=n!
set words=!words:о=o!
set words=!words:п=p!
set words=!words:р=r!
set words=!words:с=s!
set words=!words:т=t!
set words=!words:у=u!
set words=!words:ф=f!
set words=!words:х=h!
set words=!words:ц=ts!
set words=!words:ч=ch!
set words=!words:ш=sh!
set words=!words:щ=sch!
set words=!words:ъ=''!
set words=!words:ы=i!
set words=!words:ь='!
set words=!words:э=eh!
set words=!words:ю=ju!
set words=!words:я=ja!
echo !words!
)
endlocal
exit /b
:istext
set word=%*
set word=%word:а=a%
SET word=%word:б=b%
SET word=%word:в=v%
SET word=%word:г=g%
SET word=%word:д=d%
SET word=%word:е=e%
SET word=%word:ё=jo%
SET word=%word:ж=zh%
SET word=%word:з=z%
SET word=%word:и=i%
SET word=%word:й=j%
SET word=%word:к=k%
SET word=%word:л=l%
SET word=%word:м=m%
SET word=%word:н=n%
SET word=%word:о=o%
SET word=%word:п=p%
SET word=%word:р=r%
SET word=%word:с=s%
SET word=%word:т=t%
SET word=%word:у=u%
SET word=%word:ф=f%
SET word=%word:х=h%
SET word=%word:ц=ts%
SET word=%word:ч=ch%
SET word=%word:ш=sh%
SET word=%word:щ=sch%
SET word=%word:ъ="%
SET word=%word:ы=y%
SET word=%word:ь=`%
SET word=%word:э=e%
SET word=%word:ю=ju%
SET word=%word:я=ja%
echo %word%
запуск для обработки файла:
TRANSLATOR [text.txt] [>translit.txt]
запуск для обработки строки:
TRANSLATOR [строка для перевода] [>translit.txt]
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Спасибо alexii за помощь в разработке скрипта.