Advanced Mark Commands - Dired Extra Version 2 User's Manual

7 Advanced Mark Commands

F: (dired-do-find-marked-files) Find all marked files at once displaying them simultaneously. If optional noselect is non-nil then just find the files but do not select. If you want to keep the Dired buffer displayed, type C-x 2 first. If you want just the marked files displayed and nothing else, type C-x 1 first.
The current window is split across all files marked, as evenly as possible. Remaining lines go to the bottom-most window. The number of files that can be displayed this way is restricted by the height of the current window and the variable window-min-height.

dired-mark-extension: Mark all files with a certain extension for use in later commands. A ‘.’ is not automatically prepended to the string entered, you must type it explicitly.
When called from Lisp, extension may also be a list of extensions and an optional argument marker-char specifies the marker used.
dired-flag-extension: Flag all files with a certain extension for deletion. A ‘.’ is not automatically prepended to the string entered.