powershell - How to rename a file under an unknown directory, using another directory's name -

i need rename file (or copy new name) based on directory name, under unknown directory name.

i have numerous dated folders, sub-directories. under each sub-directory, file named index.txt. txt file needs renamed or copied name of directory above it. name of each of sub-directories known can used in script if necessary.

for example:

>tree c:\test /f c:\test ├───20170414124512 │   ├───directory1 │   │       index.txt │   │ │   ├───directory2 │   │       index.txt │   │ │   └───directory3 │           index.txt │   └───20170414134345     ├───directory1     │       index.txt     │     ├───directory2     │       index.txt     │     └───directory3             index.txt 

i need end result this:

• c:\test\20170414124512\directory1\directory1.txt
• c:\test\20170414124512\directory2\directory2.txt
• c:\test\20170414124512\directory3\directory3.txt
• c:\test\20170414134345\directory1\directory1.txt
• c:\test\20170414134345\directory2\directory2.txt
• c:\test\20170414134345\directory3\directory3.txt

**sorry, should have included tried. tried , did not work.

for /d /r "c:\test" %%a in (*) echo ren "%%a\index.txt" "%%~na.txt"

to avoid trying rename non existing index.txt files additonal if aschipl's suggestion should do:

@echo off /d %%j in ("c:\test\*"   ) /d %%i in ("%%~fj\*"   ) (    if exist "%%~fi\index.txt" echo ren "%%~fi\index.txt" "%%~ni.txt" ) 

if output looks ok, remove echo in last line:

ren "c:\test\20170414124512\directory1\index.txt" "directory1.txt" ren "c:\test\20170414124512\directory2\index.txt" "directory2.txt" ren "c:\test\20170414124512\directory3\index.txt" "directory3.txt" ren "c:\test\20170414134345\directory1\index.txt" "directory1.txt" ren "c:\test\20170414134345\directory2\index.txt" "directory2.txt" ren "c:\test\20170414134345\directory3\index.txt" "directory3.txt"