delete all directories except one

Question

So using the shell, and having a directory:

./parent
./parent/one
./parent/two
./parent/three
./parent/four

i want to do something like rm -rf parent/* in one command, but keeping one directory, for example 'four', so the end result would be

./parent
./parent/four

Answer 1

Easiest and practical way in my opinion is to move the exception to parent folder, delete everthing move it back

mv exceptionFolder ..
rm -rf *
mv ../exceptionFolder .