bash - how to replace underscores by spaces in file names code example

Example 1: replace filename space with underscore bash

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

Example 2: replace spaces in file names with underscores windows

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