@echo off
if "%1" == "/?" (
       echo usage: enconvert.cmd path to the file you want to transcode
       exit /b 0
)
if "%1" == "" (
       echo ENTER NAME OF DIRECTORY
       exit /b 1
)

if not exist %1 (
       echo NOT FOUND SUCH A DIRECTORY
       exit /b 1
)
where /Q iconv
if ERRORLEVEL 1 (
       echo SET UP ICONV
       exit /b 1
)
set a=%RANDOM%
MKDIR %TEMP%\%a%
FOR /R %1 %%p IN (*.txt) DO (
      iconv -f  CP866 -t UTF-8 %%p > %TEMP%\%a%\temp.txt
         copy %TEMP%\%a%\temp.txt %%p > nul
         del %TEMP%\%a%\temp.txt
)
del /q %TEMP%\%a%