Linux command-line: Bulk rename files using the 'rename' command.
On Linux/UNIX shell, you can rename single files using the 'mv' command. But if you want to rename multiple files in bulk (like changing the extension of a set of files), it is convenient to use the 'rename' utility.
This video teaches you how to use rename command on Linux to rename multiple files and also covers the different variants of rename utility found on Ubuntu vs ARCH Linux (and other distros).