Add dired replace tutorial

README.org

@@ -46,6 +46,7 @@ Emacs is free software project with many years of development and a very active
 *** Working with files
 
   * [[./doc/ido.org][Using 'ido' mode]]
+  * [[./doc/replace_text_mutiple_files.org][Replace text in multiple files using 'dired']]
     
 *** Emacs org-mode
 

doc/replace_text_mutiple_files.org

@@ -0,0 +1,32 @@
+#+date: 2023-07-24
+#+options: toc:nil num:nil author:nil
+
+* Replace text in multiple files using dired
+
+Sometimes you may need to replace words or sentences across multiple files.
+That operation could be bore, since you will need to open, replace and close
+multiple files.
+
+Emacs has options to deal with that situation using ~dired~. Let's say you need
+to replace the word "code language" in multiple files within a directory.
+
+You may follow this steps:
+
+- Open the directory using ~dired~:
+  - Use the keys[fn:1] ~C-x d~ 
+- Mark all the files where you need to make the replacement
+  - You may press the key "m" over each name of the files
+  - Optionally press "t" to mark all files
+- Then you may use ~M-x~ ~dired-do-find-and-replace~ [fn:2]
+- After this you will present with multiple occurrences of the text
+  you will replace.
+  - You may replace all the occurrences using "!"
+  - You may also check every occurrence and use backspace to make a replacement
+    by each occurrence
+
+* Footnotes
+
+[fn:1] i.e., press "Control" and "x" keys, then, press "d" in the keyboard
+
+[fn:2]  i.e., press the key "Alt" and "x", then write the instruction. You may
+press also the key "Q"