- drupal_chmod in core/
includes/ drupal.inc - Sets the permissions on a file or directory.
- file_prepare_directory in core/
includes/ file.inc - Checks that the directory exists and is writable.
- file_save_htaccess in core/
includes/ file.inc - Creates a .htaccess file in the given directory.
- file_save_upload in core/
includes/ file.inc - Saves a file upload to a new location.
- file_unmanaged_copy in core/
includes/ file.inc - Copies a file to a new location without database changes or hook invocation.
- file_unmanaged_move in core/
includes/ file.inc - Moves a file to a new location without database changes or hook invocation. This is a powerful function that in many ways performs like an advanced version of rename().
- image_save in core/
includes/ image.inc - Closes the image and saves the changes to a file.
- system_check_directory in core/
modules/ system/ system.module - Checks the existence of the directory specified in $form_element.
- _color_save_stylesheet in core/
modules/ color/ color.module - Saves the rewritten stylesheet to disk.