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for file in *; do mv "$file" `echo $file | tr ' ' '_'` ; done
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@echo off
Setlocal enabledelayedexpansion
Set "Pattern= "
Set "Replace=_"
For %%a in (*.exe) Do (
Set "File=%%~a"
Ren "%%a" "!File:%Pattern%=%Replace%!"
)
Pause&Exit