emacs cheet guide

bash.md

@@ -152,3 +152,102 @@ $ mv app/src/foo{,bar}.c
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 </p>
 
+Editing
+-------
+
+### Emacs
+
+GNU Emacs is an extensible, customizable text editor—and more.
+
+Open from Application menu as all the other programs or from the teminal. 
+
+In terminal
+```bash
+$ emacs
+```
+
+will open a new window
+
+```bash
+$ emacs -nw
+```
+will open emacs on the terminal
+
+Emacs contains a menu bar, the frame (the editor), a status bar and a command prompt at the bottom.
+
+You run a command using a combination of modifiers and keystrokes.
+for example Ctrl+x Ctrl+f will ask you to type a filename. Usage of TAB
+is available when you start type a command or navigate throughout the directories
+and files.
+
+## Terminology
+
+* Buffer - 
+Emacs reads the file into a buffer in memory. While you're editing the buffer and working with the data nothing is changed on disk
+* Windows - 
+A window in Emacs is an area of the screen in which a buffer is displayed
+* Frame - 
+a frame is a separate X window in which an Emacs buffer is displayed
+
+## Commands Modifiers
+
+* ```Ctrl as C```
+
+This usually is the abbreviation of a function
+ex. C-x C-s
+
+* ```Alt/Esc as M```
+
+This calls the function
+ex. M-x save-buffer
+
+# Files
+
+* ```C-x C-f```         Open a file or create a new one if not exist.
+                        You can tab to display the directory 's contexts
+* ```C-x C-s```         Save file
+* ```C-x C-w```         Save as
+* ```C-x b```           Iterate through buffers(open files)
+* ```C-x C-b```         List all open buffers
+* ```C-x k```           Kill the current buffer
+* ```M->```             Move cursor to the end of buffer(file)
+
+Usage: Alt + Shift + ">"
+* ```M-<```             Move cursor at the beginning of buffer(file)
+
+Usage: Alt + Shift + "<"
+
+if you want to select the whole text in the file:
+```
+$ M-< #to go at the beginning
+$ C-space
+$ M-> #to go at the end
+```
+to cancel an action
+```
+esc esc esc
+```
+
+# windows
+
+* ```C-x 1```           One window. if you have open more this return into a single one
+* ```C-x 2```           Split window which the cursor is on vertically with the same buffer
+* ```C-x 3```           Split window which the cursor is on horizontally with the same buffer
+
+Each window is splitting each time as many times as you want. To bring it back in a single
+window run C-x 1.
+
+# Edit
+
+* ```M-w```             copy
+* ```C-w```             cut
+* ```C-y```             paste
+* ```C-s```             search
+* ```C-d```             delete(forward)
+* ```DEL```             delete(backward)
+* ```C-/```             undo
+
+# Miscellaneous
+
+* ```C-g```            Cancel command. Similar if you type ESC button three times.
+* ```C-h k```          Documentation. There are many help file actually. This is a general one.