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Published on Mar 27, 2014
ded  (pronounced "dee--eee--dee") is a very complex directory editor, its ded(1) `| wc -l` has more than 1,158 lines. It probably has over 100 keys across all different modes--same key can count again.
File list, directory tree [D], workspace, RCS/SCSS commands (CVS and Subversion), and all sorts of switches, toggles, file grouping, searching, external viewer/editor/pager, shell command, Vi-style fashion.
If these haven't lost you, it probably is the right one for you. I think I will just quote the author's words as a good and fairly short summary:
"[...] to navigate through multiple file lists or a directory tree, viewing or changing file attributes rapidly. to navigate through multiple file lists or a directory tree, viewing or changing file attributes rapidly. In addition to conventional file information, it operates on the file's RCS or SCCS archives (or CVS or SVN, etc), making it useful for source-control as well as system administration. Curses-based, it runs on UNIX systems."
Note that even there is a word "editor" in the name, there is no file operations in ded, such as deletion or copying. You will need to rely on external commands.
I know my video can't really show its potential, but hopefully you can get some vague sense of it.
The author started in 1984 with an enhance of dired, then ded in 1988, introduced ncurses in 1995.
* 2013-12-05 * In C with ncurses and td_lib  (2013-12-05) * By Thomas E. Dickey * MIT License