emacs diredPlus mode
To installed, just place the file at 〔~/.emacs.d/dired+.el〕, then put this code 「(require 'dired+)」 in your emacs init file. Optionally, byte-compile it to make it load and run faster.
Initially, i needed a way to omit some files in a dired buffer. DiredPlus does the job. If you don't know what dired is, see: File Management with Emacs (dired tutorial).