2007
04.20

Emacs

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My emacs cheat sheet. I use many editors, but emacs is by far the most robust/customizable. It’s also the one I forget the most commands for since there are so many.

Keyboard Shortcuts – (Key Bindings)

Key Binding Backend Function What
it does
Quiting Things
C-x C-c M-x save-buffers-kill-emacs Quit Emacs. Exits out of Emacs. If you have open
buffers that have been modified you are prompted to save the changes
or discard them.
C-g M-x keyboard-quit If you are in a key request sequence that you can’t get out of,
this returns you to the main buffer.
ESC ESC ESC M-x keyboard-escape-quit Does about the same thing as “C-g”
C-x k M-x kill-buffer Kills the current buffer. If the buffer is modified you are
prompted to save it.
Files and directories
C-x C-f M-x find-file Open a file. This prompts for the name of a file. Once you have typed the
file it opens it in the current buffer. If the file doesn’t exist,
a blank buffer is created and Emacs allows you to begin typing (In
this case the file will not exist on the system until you save it
the first time). When you are typing the name of the file, you may
use the tab key for filename completion. Also you may use M-p and
M-n to go to the “previous” and “next” files that have been found
using find-file.
C-x C-s M-x save-buffer Save a file. This saves the current buffer.
C-x d M-x dired (directory edit) More Here. This opens the directory specified (same way as find-file). It
opens a buffer that lists the directory and allows you to perform
operations on the files. listed in that directory. There are many
features (to many to list here) that I will go into later. The most
basic is to put the cursor on the file you want and hit ENTER. This
does a find-file on that file.
C-x C-w M-x write-file Save the current file as…
C-x i M-x insert-file Insert a file
Buffers
C-x C-b M-x list-buffers This lists all buffers that are open. Emacs will typically open
a buffer for each file that you visit (if you visit a new file
without closing an old one). This will give you a list of all of
the currently open buffers and will allow you to choose one from the
list to switch to. (You will notice there are a couple of buffers
beginning with an *. These are buffers used by Emacs to store
output. You may kill them if you like.) If you have a file opened
multiple times, you will see it listed as “file” and “file
<2>”. This list of buffers is called the buffer ring
C-x b M-x switch-to-buffer Switch buffers. Does just that. The default buffer to switch to is the last one
that you came from. (Typing C-x b ENTER repeatedly swaps between
the current and the last buffer like ALT-TAB in windows.) You may
type a TAB to complete the buffer name or TAB TAB to see a list of
all of the buffer names you can type.
C-x k M-x kill-buffer Kills the current buffer. If the buffer is modified you are
prompted to save it.
Windows and frames
C-x 0 M-x delete-window Kills the current window if more than one is visible. The
buffer contained in the window is put back to the buffer ring.
C-x 1 M-x delete-other-windows If more than one window is visible in the current viewing frame,
it removes all but the current window. Other buffers remain open
but unviewed.
C-x 2 M-x split-window-vertically Splits the current viewing window into two windows placed one
over the other.
C-x 3 M-x split-window-horizontally Splits the current viewing window into two windows placed side
to side.
C-x o M-x other-window Switches between two windows.
Moving Around
C-p (up arrow) M-x previous-line Moves to the previous line.
C-n (down arrow) M-x next-line Moves to the next line.
C-f (right arrow) M-x forward-char Move forward one character
C-f (left arrow) M-x backward-char Move backward one character
M-f M-x forward-word Move forward one word.
M-b M-x backward-word Move backward one word.
C-a M-x beginning-of-line Move to the beginning of the line.
C-e M-x end-of-line Move to the beginning of the line.
M-a M-x backward-sentence Move backward one sentence.
M-e M-x forward-sentence Move forward one sentence.
C-v M-x scroll-up Page down one page.
M-v M-x scroll-down Page up one page.
M-> M-x end-of-buffer Moves to the end of the buffer.
M-< M-x beginning-of-buffer Moves to the beginning of the buffer.
C-x ] M-x forward-page In most modes does the same as M->
C-x [ M-x backward-page In most modes does the same as M-<
  M-x goto-line Goto line. Does what it says. I can’t believe that
there is not a default key binding for this (there is in XEmacs). I
usually set up in my .emacs file the line
(global-set-key “\M-g” ‘goto-line) which tells emacs to
use M-g to run the command.
C-x o M-x other-window Switches between two windows.
C-x b M-x switch-to-buffer Switch buffers. Does just that. The default buffer to switch to is the last one
that you came from. (Typing C-x b ENTER repeatedly swaps between
the current and the last buffer like ALT-TAB in windows.) You may
type a TAB to complete the buffer name or TAB TAB to see a list of
all of the buffer names you can type.
C-SPC M-x set-mark-command Set Mark. Sets the mark to the current cursor location (point). Many
commands are run on the region in between the point and mark.
C-x C-x M-x exchange-point-and-mark Exchanges the point (cursor location) and the mark.
Copying and Deleting stuff
C-_ M-x undo Undo. Undoes the last command. Can be done repeatedly.
C-d M-x delete-char Delete. Deletes the character under the point (after the cursor location).
BACKSPC M-x delete-backward-char Delete. Deletes the character before the point (before the cursor location).
M-d M-x kill-word Kills the word after the cursor location. Places on the kill ring.
M-BACKSPC M-x backward-kill-word Kills the word before the cursor location. Places on the kill ring.
C-k M-x kill-line Kill. Kills from the point to the end of the line. If repeated in a
row, all of kills go into the same kill ring entry. Doing this once
does not kill the new line at the end of the line. Repeating kills
the newline. (for example, to kill the entire current line you
would type C-a to move to the beginning of the line, and C-k C-k to
kill the line and the newline).
C-y M-x yank Yank. Inserts the last entry from the kill ring. This can be done repeatedly.
M-y M-x yank-pop Cycle through the kill ring. Operates only if the last command
was C-y
C-SPC M-x set-mark-command Set Mark. Sets the mark to the current cursor location (point). Many
commands are run on the region in between the point and mark.
C-w M-x kill-region Kills the text between the mark and the point. Places on the
kill ring. If the buffer is read only, places text on kill ring but
warns about not being able to modify buffer.
M-w M-x kill-ring-save Places text between mark and point on the kill ring without
killing text.
M-z M-x zap-to-char Deletes the text from the point up to the first instance of the specifed character
Search and Replace
C-s M-x isearch-forward Searches forward for the typed in text. C-s repeatedly searches
forward multiple times. C-r switches direction of search.
C-r M-x isearch-backward Searches backward for the typed in text. C-r repeatedly searches
backward multiple times. C-s switches direction of search.
M-% M-x query-replace Requests two patterns. Searches for first pattern and replaces
with second pattern. Prompts at each match. (y for “yes replace”,
n for “no next”, and ! for “replace all”).
C-u C-s M-x isearch-forward-regexp Search using a regular expression (as you type it).
M-C-% M-x query-replace-regexp Query replaces using a regular expression as the match.
Fixing up the text
TAB M-x indent-relative-maybe Indent the text according to the program mode you are
in.
M-C-\ M-x indent-region Runs the “TAB” on all lines in the region.
M-u M-x upcase-word Upper casifies from the point to the end of the word.
M-l M-x downcase-word Lower casifies from the point to the end of the word.
C-t M-x transpose-chars Swaps characters before and after point with one
another.
M-t M-x transpose-words Swaps current and next word with one another.
Dired – Directory Editor
C-x d M-x dired (directory edit) This opens the directory specified (same way as find-file). It
opens a buffer that lists the directory and allows you to perform
operations on the files. listed in that directory. There are many
features (to many to list here) that I will go into later. The most
basic is to put the cursor on the file you want and hit ENTER. This
does a find-file on that file.
All commands in this section will only operate when you are in dired mode.
ENTER M-x dired-advertised-find-file Runs a C-x C-f (find-file) on the currently highlighted file. If the file is a directory, that directory will be opened in dired mode in a new buffer.
+ M-x dired-create-directory Prompts for a new directory name and creates it.
d M-x dired-flag-file-deletion Flags the current file for deletion.
~ M-x dired-flag-backup-files Flags all files ending with ~ for deletion (backup files)
x M-x dired-do-flagged-delete Delete all files marked for deletion (lines beginning with a D
D M-x dired-do-delete Deletes the currently highlighted file(s)
C M-x dired-do-copy Copies the currently highlighted file(s). Prompts for the destination.
R M-x dired-do-rename Renames the currently highlighted file(s). Prompts for the destination.
% R M-x dired-do-rename-regex Renames the currently highlighted file(s) using regular expressions.
Prompts for a regex for from and to. (example – from regex \(.+\).txt, to regex \1.text)
m M-x dired-mark Mark the current file (marks with a *)
u M-x dired-unmark Unmark the current file (marks with SPC – SPC is blank)
* c M-x dired-change-marks Changes marks from first prompted letter to second prompted letter (example – * c D SPC – this will clear the deletion flag)
! M-x dired-do-shell-command Execute command on files marked with *. If your command contains a *, the list of marked files will be substituted in place and executed. Otherwise, the command will be played once with each marked file as the last argument.
g M-x revert-buffer Refreshes the current dired directory.
Help – Finding it
C-h t M-x help-with-tutorial Begins the Emacs built in Tutorial – highly recommended
C-h k M-x describe-key Allows you to type in key strokes and see the backend function
that they are running.
C-h f M-x describe-function Allows you to type a function name and receive an explanation of
what it does.
C-h v M-x describe-variable Allows you to type a Emacs variable name and see its
contents
C-h b M-x describe-bindings Show a table of all of the current key bindings.
C-h i M-x info This one is possibly the most important. It
enters into the Emacs help browser which allows you to read in depth
about just about any subject relating to Emacs. (Basic commands are
“l” for last, “n” for next, and “p” for previous.) I’ll talk more
about this later.
Text Registers
C-x r s M-x copy-to-register Prompts for register letter. Saves text between point and mark in the register.
C-x r i M-x insert-register Prompts for register letter. Inserts the text saved in that register at point.
Position Registers
C-x r SPC M-x point-to-register Prompts for register letter. Saves point in register.
C-x r j M-x jump-to-register Prompts for register letter. Jumpts to point saved in that register.
Bookmarks
C-x r m M-x bookmark-set Prompts for bookmark name (default is buffer name).
Saves point in a bookmark. This information is saved even if you
close Emacs.
C-x r b M-x bookmark-jump Prompts for bookmark name. Jumpts to point saved in
that bookmark (Even if you had closed your emacs session).
C-x r l M-x bookmark-bmenu-list Lists all saved bookmarks. Typing “j” when on a
bookmark jumps to the file. Dired commands are used to delete
bookmarks (Type “d” when on file – then “x” to delete bookmark).
Rectangles – (Priceless)
C-x r o M-x open-rectangle Opens rectangle of whitespace between point and mark.
C-x r t M-x string-rectangle Replaces text between point and mark with rectangle of
text (prompts for text). This is a major timesaver. Typing id=func>C-x r t “Other Text” RET would replace

<mark> Some Text
Some Text
Some Text<point>		 With <mark> Other Text
Other Text
Other Text<point>

C-x r k M-x kill-rectangle Kills text between point and mark and places in
rectangle kill ring. C-x r y M-x yank-rectangle Inserts last killed rectangle at point.

Etags – (Jumping around source code quickly) M-. Jumps to tag cursor is on M-* Jumps to previous tag M-, To cycle thru tags with the same name M-x M-x find-tag-other-window split screen and open tag in second window

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