find . -maxdepth 1 ! -path . -exec rm -r {} +
-exec command {} +
This variant of the -exec action runs the specified command on the selected files, but the command
line is built by appending each selected file name at the end; the total number of invocations of
the command will be much less than the number of matched files. The command line is built in much
the same way that xargs builds its command lines. Only one instance of `{}' is allowed within the
command, and it must appear at the end, immediately before the `+'; it needs to be escaped (with a
`\') or quoted to protect it from interpretation by the shell. The command is executed in the
starting directory. If any invocation with the `+' form returns a non-zero value as exit status,
then find returns a non-zero exit status. If find encounters an error, this can sometimes cause an
immediate exit, so some pending commands may not be run at all. For this reason -exec my-com‐
mand ... {} + -quit may not result in my-command actually being run. This variant of -exec always
returns true.
参考：https://unix.stackexchange.com/questions/584919/delete-all-files-within-a-directory-without-deleting-the-directory
