cmd - Command line to change file extension of all files under a folders and its subfolders -

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i looking command line can change file extension of files under folder , subfolders. there way this?

i tried ren *.js *.txt changes file extension of files under 1 folder.

i assume ms-dos mean command prompt on windows. not many people still use ms-dos.

the following run ren command on each folder within hierarchy contains .js files. bit more efficient running ren each file individually.

for /r %f in (.) @if exist "%f\*.js" ren "%f\*.js" "*.txt"

double percents (%f becomes %%f) if run within batch script.


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