apang

@echo off
for /f "delims=" %%i in ('dir /a-d /b /s "d:\soft\doc.txt"') do (
  (for /f "usebackq delims=" %%j in ("%%i") do (
    set "str=%%j"
    setlocal enabledelayedexpansion
    echo !str:orc=hum!
    endlocal
  ))>$
  move $ "%%i"
)
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