2011年1月28日星期五

Emacs Key Combinations

Note that C-x means Control-X while M-x means Meta-X where meta may mean hitting and releasing the escape key, or alt. These keys are excerpted from the Unix in a Nutshell book. The first column has their default key binding; the second their function name; last is a short description.

1. File Handling Commands

C-x C-f find-file Find a file and read it to screen.
C-x C-v find-alternate-file Read a different file.
C-x i insert-file Insert a file at the cursors position.
C-x C-s save-buffer Save the current buffer.
C-x C-w write-file Write the contents of the buffer to a file.
C-x C-c save-buffers-kill-emacs Save all open buffers and get out of emacs.
C-z suspend-emacs Suspend emacs.

2. Cursor Movement Commands

C-f forward-char Move cursor one character.
C-b backward-char Move backward one character.
C-p previous-line Move up one line.
C-n next-line Move down one line.
M-f forward-word Move to the next word. (words are defined by whitespace/special characters.)
M-b backward-word Move to the previous word.
C-a beginning-of-line Move to the beginning of the line.
C-e end-of-line Move to the end of the line.
M-a backward-sentence Move back one sentence.
C-v scroll-up Scroll up one screen.
M-v scroll-down Scroll down one screen.
C-x [ backward-page Go back one page.
C-x ] forward-page Go forward one page.
M-> end-of-buffer Move to end of buffer.
M-< beginning-of-buffer Move to beginning of the current buffer.
C-l recenter Redraw the screen with the current line in the center.
M-(a number) digit-argument Do the next command (a number) of times.

3. Deletion Commands

Del backward-delete-char Delete the previous character.
C-d delete-char Delete the character under the cursor.
M-Del backward-kill-word Delete the previous word.
C-k kill-line Delete from the cursor to the end of line.
M-k kill-sentence Delete the sentence the cursor is in.
C-x Del backward-kill-sentence Delete the previous sentence.
C-y yank Restore deleted text at cursor.
C-w kill-region Delete a marked region.
backward-kill-paragraph Delete the previous paragraph.
kill-paragraph Delete from the cursor to the end of the paragraph.

4. Paragraphs and Regions

[email protected] set-mark Mark the beginning (or end) of a region.
C-Space set-mark Ibid.
C-x C-p mark-page Mark the current page.
C-x C-x exchange-point-and-make Exchange the location of the cursor and the mark.
C-x h mark-whole-buffer Mark the current buffer.
M-q fill-paragraph Reset the paragraph.
M-g fill-region Reformat individual paragraphs with region.
M-h mark-paragraph Mark select paragraph.

5. Stopping and Undoing Commands

C-g keyboard-quit Stop current command Now!
C-x u advertised-undo Undo the last edit (do it often)
revert-buffer Return the buffer to the state when last autosaved.

6. Transposition Commands

C-t transpose-chars Transpose the two letters.
M-t transpose-words Switch two words.
C-x C-t transpose-lines Switch two lines.
transpose-sentences Switch two sentences.
transpose-paragraphs Switch two paragraphs.

7. Capitalization Commands

M-c capitalize-word Capitalize the first letter of the current word.
M-u upcase-word Make the word all uppercase.
M-l downcase-word Make the word all lowercase.
C-x C-l downcase-region Make the region all lowercase.
C-x C-u uppercase-region Make the region all uppercase.

8. Incremental Search Commands

C-s isearch-forward Start an incremental search forward.
C-r isearch-backward Starts an incremental search in the reverse direction.
Meta Stop a successful search.
C-g keyboard-quit Stop searching and return to the starting point.
Del Delete an incorrect character whilst searching.

9. Word Abbreviation Commands

abbrev-mode Enter abbreviation mode.
C-x - inverse-add-global-abbrev Type in a global abbreviation, then its meaning.
C-x C-h inverse-add-local-abbrev Type in a local abbreviation, then its meaning.
unexpand-abbrev Undo the last word abbreviation.
write-abbrev-file Write out the word abbreviation file.
edit-abbrevs Edit the current word abbreviations.
list-abbrevs View the current word abbreviations.
kill-all-abbrevs Kill any abreviations for this session.

10. Buffer Manipulation Commands

C-x b switch-to-buffer Move to the specified buffer.
C-x C-b list-buffers Display the list of currently active buffers.
C-x k kill-buffer Kill the current buffer
kill-some-buffers Ask about deleting each buffer currently active.
rename-buffer Rename the current buffer to something else.
C-x s save-some-buffers Ask whether to save each modified buffer

11. Window Commands

C-x 2 split-window-horizontally Divide the current window horizontally in two.
C-x 5 split-windws-vertically Divide the current window vertically in two.
C-x > scroll-right Scroll the window right.
C-x < scroll-left Scroll the window left.
C-x 0 delete-window Delete the current window.
C-x 1 delete-other-windows Delete all the windows except this one.
delete-windows-on Delete all windows open to a particular buffer.
C-x ^ enlarge-window Make the current window taller.
shrink-window Make the current window smaller.
C-x } enlarge-window-horizontally Make the window wider.
C-x { shrink-window-horizontally Make the window less wide.
M-C-v scroll-other-window Scroll the other window.
C-x 4 f find-file-other-window Find a file in the other window.
C-x 4 b switch-to-buffer-other-window Select a buffer in the other window.
compare-windows Compare two buffers and show the first difference.

12. Special Shell Characters

shell Start a shell.
C-c C-c interrupt-shell-subjob Terminate the current job in a shell.
C-c C-d send-shell-eof Send the EOF character (Ctrl-d)
C-c C-u kill-shell-input Erase the current line.
C-c C-w backward-kill-word Erase the previous word.
C-c C-z stop-shell-subjob Suspend the current shell job.

13. Indentation Commands

C-x set-fill-prefix Prepend each line in paragrph with characters
from beginning of the line up to the current
cursor column. cancel by doing this in column 1.
M-C-\ indent-region Indent a region to match the first line in region.
M-m back-to-indentation Move the cursor to first character in line.
M-C-o split-line Split line at cursor into two lines... weird.
fill-individual-paragraphs Reformat indented paragraphs, keep indentation.

14. Centering Commands

M-s center-line Center the current line.
center-paragraph Center the paragraph that the cursor is on.
center-region Center the currently defined region.

15. Macro Commands

C-x ( start-kbd-macro Start a new macro definition.
C-x ) end-kbd-macro End the current macro definition.
C-x e call-last-kbd-macro Execute the last defined macro.
M-(number) C-x e call-last-kbd-maco Do that last macro (number times).
C-u C-x ( stat-kbd-macro Execute last macro and add to it.
name-last-kbd-macro Name the last macro before saving it.
insert-last-keyboard-macro Insert the macro you made into a file.
load-file Load a file with macros in it.
C-x q kbd-macro-query Insert a query into a keyboard macro.
M-C-c exit-recursive-edit Get the hell out of a recursive edit.

16. Detail Information Help Commands

C-h a command-apropos What commands work like this...?
apropos What functions and variables work like this...?
C-h c describe-key-briefly What command does this key sequence do?
C-h b describe-bindings What are the key bindings for this buffer?
C-h k describe-key What command does this sequence do, and tell me about it.
C-h l view-lossage What are the last 100 characters typed?
C-h w where-is What is the key binding for this?
C-h f describe-function What does this function do?
C-h v describe-variable What is this variable?
C-h m describe-mode Tell me about this mode.
C-h s describe-syntax What is the syntax table for this buffer?

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