@echo off

Setlocal enabledelayedexpansion

​

Set "Pattern= "

Set "Replace=_"

​

For %%a in (*.exe) Do (

    Set "File=%%~a"

    Ren "%%a" "!File:%Pattern%=%Replace%!"

)

​

Pause&Exit

for file in *; do mv "$file" `echo $file | tr ' ' '_'` ; done

​

find . -type f -name "* *" -exec bash -c 'mv "$0" "${0// /_}"' {} \;

for file in *; do mv "$file" $(echo $file | tr ' ' '_') ; done

Get-ChildItem C:\NewFolder -Directory -Recurse | Rename-Item  -NewName {$_.Name -replace '_',' '}

string_with_underscore = "hello_world"

string_with_space = string_with_underscore.replace("_", " ")

print(string_with_space)