Select the files you want to rename, right-click on any of them, and select the “Rename…” option from the menu. A dialog box will appear, asking you to specify the criteria for renaming the files.
Bulk rename files in Finder
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How to Search the current folder as the default
Annoyed that every time you use the Search in Finder, you search your entire Mac and not the current folder?
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6 Mac Finder Features and Shortcuts
Useful Finder tips including bulk renaming, keyboard navigation, search settings, and background removal