Updating README and diff tutorial

README.org

@@ -34,13 +34,14 @@ opportunity to learn about computers, files, directories and programs.
  * [[./tutorial/files_directories.org][Learning about files and directories]]
  * [[./tutorial/rsync.org][Using rsync to copy files]]
  * [[./tutorial/search_files.org][Searching for files in the system]]
- * [[./tutorial/diff.org][Comparing two files or directories]]
+ * [[./tutorial/diff.org][Comparing two files or directories: 'diff']] 
  * [[./tutorial/dd_command_flash_usb.org][Using dd command to flash usb]]
  * [[./tutorial/compress_pdf.org][Compress a pdf file]]
  * [[./tutorial/luakit.org][Searching and editing configuration files]]
  * [[./tutorial/pacman.org][Use package manager in Parabola GNU-linux: verify packages in cache]]
  * [[./tutorial/removing_packages.org][Removing packages in Parabola GNU-Linux]]
-
+ * [[./tutorial/diff_patch.org][diff and patch]]
+   
 ** Disk space utilization and manipulation
 
  * [[./tutorial/ncdu.org][Exploring disk space with 'ncdu']]
@@ -64,6 +65,10 @@ opportunity to learn about computers, files, directories and programs.
  * [[./tutorial/streaming_terminal.org][A really nice feature: streaming from terminal!]]
  * [[./tutorial/wgetandmore.org][Download from terminal: wget curl, pandoc ]]
 
+** Communication, messengers
+
+
+
 ** Text edition
 
  * [[./tutorial/sed_subsitute.org][Using 'sed' editor to substitute text]]

tutorial/diff.org

@@ -18,11 +18,8 @@ You can redirect the output to a file and make a patch: a file containing the di
   diff file1.txt file2.txt  patch.txt 
 #+end_example
 
-
-
 ** Comparing directories
 
-
 Some arguments may be hepful to have an output showing the differences between two directories:
 ~--brief~ (show only the differences) and ~-r~ (compare the directories that are located within the main directory also)