How can delete all files except one from a directory?

Question

I need to delete all files, except one (its name is defined), from a given directory.

How can I do this from the terminal in OS X? Can I do this with one single command?

Answer 1

shopt -s extglob && rm !(non_delete_file)

or

rm -f !(non_delete_file)

or

find . ! -name non_delete_file -delete

Note that the above find command will work recursively -- it will delete all files and directories in the current directory, and in all subdirectories. If that is a problem, use -type f (to match only files) and -maxdepth 1 (to match things only in the current directory, ignoring subdirectories)

find . -type f -maxdepth 1 ! -name non_delete_file -delete

Answer 2

1. move the file that you want to preserve to somewhere outside the directory
2. remove everything in the directory using your favourite method
3. move the file that you want to preserve back into the directory

Not exactly 'hi-tech' but it is much harder to accidentally delete the file that you want to preserve if you use this approach.

Obviously, this approach fails if the file needs to continuously exist in the directory while all the carnage is happening.

Answer 3

Try

rm `ls | grep -v '^defined$'`