I know this will delete everything in a subdirectory and below it:
rm -rf <subdir-name>
But how do you delete everything in the current directory as well as every subdirectory below it and the contents of all of those subdirectories?
Practice safe computing. Simply go up one level in the hierarchy and don't use a wildcard expression:
cd ..; rm -rf -- <dir-to-remove>
The two dashes
<dir-to-remove> is not a command-line option, even when it begins with a dash.
Will delete all files/directories below the current one.
find -mindepth 1 -delete
If you want to do the same with another directory whose name you have, you can just name that
find <name-of-directory> -mindepth 1 -delete
If you want to remove not only the sub-directories and files of it, but also the directory itself, omit
-mindepth 1. Do it without the
-delete to get a list of the things that will be removed.