Emacs Commands

The newly learned ones:

C-x i: insert file
C-x C-v: Find alternative file
C-x C-w: Save as copy
C-h: Enter help
C-h k: Help about keystroke
C-h f: Help about function

Use goto-line command to go to a specific line.

C-_: Undo (same as C-x u)
M-d: Delete a word on the cursor (handy!)

Everything you delete with C-k, C-w and copy with M-w will go into the kind ring. C-u with Del or C-d will go into the kill ring as well. But the sole single chatacter deletion will not go into the kill ring.

C-space: activate the mark region
C-x C-x: Verify the selected region
C-w: Delete the currently marked region;
M-h: Mark a paragraph
C-x h: Mark the entire buffer
M-w: kill-ring-save, which could be used in copying text.
M-y: delete the most recent text in kill ring and get the next ones

M-c: Capitalize the first character
M-l: Put a word in lowercase
M-u: Put a word in uppercase
M-x ov: Toggle overwrite mode
M-x revert-buffer: Undo all changes made since last saving
C-r: Backward searching
C-s C-w: Search the word
C-s C-y: Search the text till the end of line
C-s Enter: Non-incremental search
M-%: Query replace

The variable case-fold-search determines whether searches are case-sensitive.
The variable case-replace determines whether to replace according to the old capitalization pattern.

C-M-s: Regex Incremental search
C-M-%: Regex query replace

NOTE: Spell checking a text needs installation of ispell or flyspell, so the related chapters in Learning GNU Emacs are ignored here

M-/: Complete the word with nearest word with that as prefix (Can search cyclically when used repeatly)

Command abbrev-mode: abbreviation mode
- C-x a i g: for add-inverse-global
- C-x a i l: for add-inverse-local
edit-abbrevs
list-abbrevs
kill-all-abbrevs: Stop use of all abbreviations

C-x b: switching between buffers
C-x C-b: show buffer list
C-x ->: Cycle through the buffers
C-x k: Delete a buffer
kill-some-buffers can do the above in a batch way

C-x 4 f: to open a file in a new window
C-x 4 b: to open a buffr in a new window
C-M-v: to scroll the other window
C-x o: move from one window to another
C-x 0: delete the window you are in

C-x s: Save all buffers
C-x C-q: Make any buffer read-only

C-x ^: Make the current window taller
C-x }: Make the current window wider
C-x {: Make the current window narrower

C-x r m: Place a bookmark at the cursor position
C-x r b: Jump to a bookmark
C-x r l: List all bookmarks

Under dired:

n, p etc.: move between lines
v: preview file
C-x d: Start Dired
A: Do a regular search on marked files, M- to find next match
B: Byte-compile file
C: Copy file
d: flag for deletion
D: Delete instantly
e: Edit file
f: Find
g: Refresh
i: Insert a listing of subdirectory to the current dired buffer
L: Load file
m: Mark
M: chmod
o: Find file in another window and move there
C-o: Find file but don't move
Q: Query replace string in marked files
R: rename file
s: Sort the display by date or by filename
v: View file in read-only mode
w: copy the filename into kill ring
Z: compress
.: Flag numbered backups for deletion
!: Do shell commmand on current or marked files
+: create a directory
^: move up to parent directory

compile goes to compilation mode

C-x `: move to next error and its position
M-n: Move to next error message
M-p: Move to next previous message
C-c C-c: Visit source for current error message

M-;: Indent for comment
C-M-\: Indent each line in the region
M-m: Back to the first non-blank character on the line

visit-tags-table: Connect the TAGS file generated by etags to Emacs
M-: find tag

list-faces-display: List all code font

C, C++ support

M-a: move to the beginning of current statement
C-M-a: Moveto the beginning of surrouding function
C-M-h: Mark the entire function
C-c C-u: Move to the beginning of current preprocessor conditional
c-set-style: Set C language style ˘