How Can I Delete All But a Few Files in a Directory?

You could also use a file manager like Midnight Commander (mc) for this task. It gives you a visual interface to manage files, making it a bit easier if you're not yet familiar with the terminal.

You can use extended globs for this! First, enable the extended glob option by running `shopt -s extglob`. After that, you can do a dry run with `ls !(file_to_keep1.mp3|file_to_keep2.mp3)` to see what will be deleted. If that looks good, swap `ls` for `rm` and it will delete everything except the files you want to keep.

Here's a simpler approach: move the files you want to keep to a different location temporarily, delete everything else, and then move your files back. It minimizes any risks and is a lot easier if you're not comfortable with the command line.

Try this command: `find . -type f ! -name 'file1.mp3' ! -name 'file2.mp3' -delete`. This command finds all files in the current directory, excludes the two you want to keep, and deletes everything else. I recommend running it without the `-delete` option first to double-check it's picking the right files.