Write a script modify with the following syntax:
modify [-r] [-l|-u] <dir/file names...>
modify [-r] <dir/file names...>
modify [-h]
modify_examples
which will modify file names.
The script is dedicated to lowerizing (-l) file names, uppercasing (-u) file names or internally calling sed command with the given sed pattern which will operate on file names. Changes may be done either with recursion (-r) or without it. Write a second script, named modify_examples, which will lead the tester of the modify script through the typical, uncommon and even incorrect scenarios of usage of the modify script.