38.17 Other Dired Features
The w command (
dired-copy-filename-as-kill) puts the
names of the marked (or next n) files into the kill ring, as if
you had killed them with C-w. The names are separated by a space.
The main purpose of this command is so that you can yank the file
names into arguments for other Emacs commands. It also displays what
was pushed onto the kill ring, so you can use it to display the list
of currently marked files in the echo area. With a zero prefix
argument, this uses the absolute file name of each marked file. With
just C-u as the prefix argument, it uses file names relative to
the Dired buffer's default directory. (This can still contain slashes
if in a subdirectory.) As a special case, if point is on a directory
headerline, w gives you the absolute name of that directory.
Any prefix argument or marked files are ignored in this case.
The command M-x dired-compare-directories is used to compare
the current Dired buffer with another directory. It marks all the files
that are “different” between the two directories. It puts these marks
in all Dired buffers where these files are listed, which of course includes
the current buffer.
The default comparison method (used if you type <RET> at the
prompt) is to compare just the file names—each file name that does
not appear in the other directory is “different”. You can specify
more stringent comparisons by entering a Lisp expression, which can
refer to the variables
size2, the respective
mtime2, the last modification
times in seconds, as floating point numers; and
fa2, the respective file attribute lists (as returned by the
file-attributes). This expression is evaluated for
each pair of like-named files, and if the expression's value is
nil, those files are considered “different”.
M-x dired-compare-directories <RET> (>
mtime1 mtime2) <RET> marks files newer in this directory than in
the other, and marks files older in the other directory than in this
one. It also marks files with no counterpart, in both directories, as
On the X window system, Emacs supports the “drag and drop”
protocol. You can drag a file object from another program, and drop
it onto a Dired buffer; this either moves, copies, or creates a link
to the file in that directory. Precisely which action is taken is
determined by the originating program. Dragging files out of a Dired
buffer is currently not supported.