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

A one liner

cmd /e:on /v:on /c "for %f in ("* *.exe") do (set "n=%~nxf" & set "n=!n: =_!" & ren "%~ff" "!n!" )"

Spawn a cmd instance, with extensions and delayed expansion enabled, and for each exe file with spaces in name, replace spaces with underscores and rename the file with the new name