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I have a bunch of files with the same prefix "prefix_filename.txt". I want to remove this prefix and underscore from all filenames, how can I do this?

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I'd normally use some tool for this, like Renamer, but if you don't want to use an external tool, you can find some batch code in the accepted answer to this SU question – ho1 Nov 19 '11 at 8:14

Use the for command - no batch file needed or third party tool either

for /f "tokens=1* delims=_" %a in ('dir /b /a-d') do @if "%b" NEQ "" ren "%a_%b" "%b"

(always test first)

To break it down, the for command executes the dir command in bare (/b) format and showing files only (attributes NOT directory - /a-d). The tokens are the "columns" in the output - Column 1, then Column 2 is everything NOT in column 1, excluding the delimiter. The delimiter is the underscore. Now that everything is defined, we "do" a check to ensure there is a second column (%b) and if there is, we rename the full file name to the file name without the prefix and underscore.

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