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+====== Emacs ======
+Usefull commands and configuration scripts for the emacs text editor:
+===== Help =====
+  * //C-h f// documentazione di una funzione
+  * //C-h m// documentazione del major mode attuale
+  * //C-h r// emacs manual info
+  * //C-h t// emacs interactive tutorial
+  * //C-h w// dice la scelta rapida associata al comando
+  * //C-h F// ricerca le info di un comando
+  * //C-h a// cerca un comando con espressione regolare
+===== Common commands =====
+  * // M-x revert-buffer // reload an open file (a more fast trick is to use the command // C-x C-v <RET> //)
+===== Registers =====
+  * //C-x r s r//                       Copy region into register r
+  * //C-x r i r//                       Insert text from register r
+  * //M-x append-to-register <RET> r//  Append region to text in register r
+  * //M-x prepend-to-register <RET> r// Prepend region to text in register r
+  * //C-x r r//                         Copy Rectangle into register r
+  * //C-x r k//                         Kill Rectangle
+  * //C-x r t string <RET>//            Replace each line rectangle with string
+===== Registers and Bookmarks (to save and jump in specific positions of the file) =====
+  * // C-x r SPC r // Save position of point in register r
+  * // C-x r j r // Jump to the position saved in register r
+  * // C-x r m RET // Set the bookmark for the visited file, at point
+  * // C-x r m bookmark RET // Set the bookmark named bookmark at point
+  * // C-x r b bookmark RET // Jump to the bookmark named bookmark
+  * // C-x r l // List all bookmarks
+  * // M-x bookmark-save // Save all the current bookmark values in the default bookmark file
+===== CVS =====
+  * //C-x v i// Register a file for version control
+  * //C-x v v// Commit a modified file that is already registered for version control. //C-c C-c// to save the revision comment and commit the change.
+===== Editing =====
+  * // M-l // Convert following word to lower case --- // M-u // Convert following word to upper case
+  * // M-c // Capitalize the following word
+  * // C-x C-l // Convert region to lower case --- // C-x C-u // Convert region to upper case
+  * // M-% // Substitution of a string
+===== File management (Dired mode) =====
+How to use emacs to manage file in your harddisk
+With //C-x C-f// or //C-x d// you can open a directory
+Now you can use on the file or on the directory where the cursor is located the following commands:
+  * //Enter// Open the file
+  * //q//     Close the directory
+  * //C//     Copy the file
+  * //R//     Rename the file
+  * //D//     Delete the file
+  * //+//     Create a new dir
+  * //Z//     Compress/decompress the file by gzip
+To act on a set of files or directories you can use the following commands to mark them:
+  * //m//     Mark a file/directory
+  * //u//     Unmark a file/directory
+  * //U//     Unmark all marked files/directories
+  * //% m//   Mark a files/directories using a regular expression
+To refresh the listing of files or directories can be used the //g// key, and the key //^// can be used to go to the parent directory. As for any emacs environment, you can use the //M+!// (or //M-x shell-command//) to run a shell command and use more powerful tools such as //awk//, //find//, //sed// or //grep//.
+===== Install a new language =====
+For example the Italian language using Ubuntu
+Download the new language from the Ubuntu repository:
+<code bash>
+sudo apt-get install iitalian
+</code>
+Load the downloaded language in emacs with the command:
+  * //M-x ispell-change-dictionary//
+Activate, if needed, the automatic correction:
+  * //M-x flyspell-mode//
+To check the lessical correctness of the current buffer use the command:
+  * //M-x flyspell-buffer//
+==== The Italian language case ====
+The Italian language is not properly recognized by the //ispell// dictionary, therefore is better to install //aspell//.
+To install //aspell// in Ubuntu linux, install the following packets from Ubuntu repository:
+<code bash>
+sudo apt-get install aspell aspell-it
+</code>
+Now, the //.emacs// file located in the home directory must be modified in order to setup //aspell// as the emacs default dictionary. Add to the //.emacs// file the following lines:
+<code lisp>
+(setq ispell-program-name "aspell")
+(setq ispell-list-command "list")
+(setq ispell-dictionary "italiano");; use the Italian dictionary
+</code>
+the last row must be deleted in the case you do not want that the default dictionary is Italian.
+The command explained before for //ispell// also works for //aspell//: //M-x ispell-change-dictionary//, //M-x flyspell-mode// and //M-x flyspell-buffer//.
+NB: The installation of the Italian dictionary in emacs has been also explained in Italian [[it:informatica:Emacs installazione dizionario italiano|here]]
+===== Generate TAGS file =====
+With this command you can generate ''TAGS'' file which contains indexes of all symbols in the project.
+<code bash>
+find . -type f -iname "*.[ch]" | etags -
+</code>
+For example, in emacs with the //M-.// command you can search the definition of a function or of a structure starting from its calling or use.

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