How to replace all spaces by underscores in all file names of a folder?

Question

I\'m trying to rename all the files inside a folder (all .exe files). I want to replace all the spaces with underscores, e.g. qwe qwe qwe asd.exe to qwe_q

Answer 1

Save the following 2 commands in a .bat file. It will replace " " with "_" in all files and folders, recursively, starting from the folder where the file is stored.

forfiles /s /m *.* /C "cmd /e:on /v:on /c set \"Phile=@file\" & if @ISDIR==FALSE ren @file !Phile: =_!"
forfiles /s /C "cmd /e:on /v:on /c set \"Phile=@file\" & if @ISDIR==TRUE ren @file !Phile: =_!"

Note: First line is doing this for files, and second one is doing this for folders. Each line can be used separately.