ExifTool is an incredibly powerful piece of software that reads, writes, and edits metadata to and from files. It is a command-line tool that to start with can look very complicated but I tend to re-use the same snippets over and over.
It’s worth noting; that this is a personal note, it’s not a tutorial - it’s somewhere I can dump my snippets to use later.
Filenames based on timestamps
Rename all files recursively from the current dir to YEAR-MONTH-DAY_HOURSMINSSECS.ext eg: 2020-06-10_093033.jpg
exiftool "-FileName<datetimeoriginal" -d "%Y-%m-%d_%H%M%S%%-c.%%e" -r $PWD/${1#./}