find files in elisp

Getting list of filenames from OS file system

;; first 20 elements of results returned by recursively searching for file that contains ".org" in the directory "."
(-take 20 (directory-files-recursively "." ".org"))

("./7z.org" "./about_this_zettelkasten.org" "./abstract_tasks.org" "./activity_watch.org" "./add_class_to_element_in_js.org" "./advice.org" "./amazing_brushes_in_krita.org" "./anacron.org" "./automatic_backup.org" "./bcrypt.org" "./bind_key_in_doomemacs.org" "./c.org" "./c_array_indexing.org" "./c_language.org" "./c_sharp.org" "./centering_element_in_css.org" "./check_kernel_version_in_linux.org" "./citar.org" "./cite_export_without_using_org_cite_link.org" "./click_shield_in_css.org")