Windows batch file - Concatenate all files in subdirectories

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Need to concatenate all of the javascript files in a directory and all of its sub-directories into one file.

Right now I have a very simple command in a batch file that concatenates all of the matching files in one directory into one file:

copy C:\javascripts\*.js concatenated.js

However, this only works for the one directory and not any of its sub-directories. How can I do this same thing and also include all of the matching files in the sub-directories?

Thanks so much!

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