The ‘-D’ option makes find produce diagnostic output.
Much of the information is useful only for diagnosing problems, and so
most people will not find this option helpful.
The list of debug options should be comma separated. Compatibility of
the debug options is not guaranteed between releases of findutils.
For a complete list of valid debug options, see the output of
find -D help.
Valid debug options include:
Show the expression tree in its original and optimized form.
Print messages as files are examined with the stat and lstat system calls. The find program tries to minimise such calls.
Prints diagnostic information relating to the optimisation of the expression tree; see the ‘-O’ option.
Prints a summary indicating how often each predicate succeeded or failed.
Enable all of the other debug options (but ‘help’).
Explain the debugging options.