diff --git a/2020/2020-02-15_gnuLinuxCourse/slides/index.md b/2020/2020-02-15_gnuLinuxCourse/slides/index.md
index e2c016f1754aec5462a6afeec3a09b8a1774ce51..af6c0b2a7d49a536019f2efe53d7eb9580b15577 100644
--- a/2020/2020-02-15_gnuLinuxCourse/slides/index.md
+++ b/2020/2020-02-15_gnuLinuxCourse/slides/index.md
@@ -1,6 +1,6 @@
# Presentation Title
-## Month XYth, 2019
+## 26 March 2020
<div style="top: 6em; left: 0%; position: absolute;">
<img src="theme/img/lcsb_bg.png">
diff --git a/2020/2020-02-15_gnuLinuxCourse/slides/intro_aim.md b/2020/2020-02-15_gnuLinuxCourse/slides/intro_aim.md
index 82ac41923f28367c988b52b1560b7e756821336d..7a24347ffa13ebff6e98456051528a8dab2d5bc2 100644
--- a/2020/2020-02-15_gnuLinuxCourse/slides/intro_aim.md
+++ b/2020/2020-02-15_gnuLinuxCourse/slides/intro_aim.md
@@ -10,7 +10,4 @@
+ Using SSH, a de-facto standard for secure communication
<!-- .element: class="fragment" -->
-
-
-
<!-- <iframe width="560" height="315" src="https://www.youtube-nocookie.com/embed/A-HIlNGczgU" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe> -->
diff --git a/2020/2020-02-15_gnuLinuxCourse/slides/intro_beforewebegin.md b/2020/2020-02-15_gnuLinuxCourse/slides/intro_beforewebegin.md
index e8c3dc090c39e55efb1bf20e53cd4ce6412a34e7..842595fb38c6dff14a8ade1d8a742fa844396dc3 100644
--- a/2020/2020-02-15_gnuLinuxCourse/slides/intro_beforewebegin.md
+++ b/2020/2020-02-15_gnuLinuxCourse/slides/intro_beforewebegin.md
@@ -18,7 +18,7 @@
<!-- .element: class="fragment" -->
-[1]: https://git-r3lab.uni.lu/R3/school/courses/blob/gnu-linux/2020/2020-02-15_gnuLinuxCourse/resources.md
+[1]: https://git-r3lab.uni.lu/R3/school/courses/blob/develop/2020/2020-02-15_gnuLinuxCourse/resources.md
[2]: https://duckduckgo.com
[3]: https://unix.stackexchange.com/
[4]: https://www.reddit.com/r/linux/
diff --git a/2020/2020-02-15_gnuLinuxCourse/slides/list.json b/2020/2020-02-15_gnuLinuxCourse/slides/list.json
index 4b966d753c72d5b5d4135b7c9af3e190181529b8..1f6a715f628dc70e76ebe258aad540a36bb5008c 100644
--- a/2020/2020-02-15_gnuLinuxCourse/slides/list.json
+++ b/2020/2020-02-15_gnuLinuxCourse/slides/list.json
@@ -5,9 +5,13 @@
{ "filename" : "intro_aim.md"},
{ "filename" : "shell.md"},
{ "filename" : "shell/start.md"},
+ { "filename" : "shell/file-explorer-basic.md"},
+ { "filename" : "shell/file-explorer-basic-concepts.md"},
{ "filename" : "shell/effective-cmd-editing.md"},
+ { "filename" : "shell/effective-cmd-editing-concepts.md"},
{ "filename" : "shell/cp-mv.md"},
{ "filename" : "shell/rm.md"},
+ { "filename" : "shell/cp-mv-rm-concepts.md"},
{ "filename" : "ssh_intro.md"},
{ "filename" : "ssh_intro_2.md"},
{ "filename" : "ssh_intro_3.md"},
diff --git a/2020/2020-02-15_gnuLinuxCourse/slides/shell/cp-mv-rm-concepts.md b/2020/2020-02-15_gnuLinuxCourse/slides/shell/cp-mv-rm-concepts.md
new file mode 100644
index 0000000000000000000000000000000000000000..198dbdf6b41a775204bcfaa004aabe75e02a3bb2
--- /dev/null
+++ b/2020/2020-02-15_gnuLinuxCourse/slides/shell/cp-mv-rm-concepts.md
@@ -0,0 +1,20 @@
+# File Explorer: Copy(cp), Move(mv) and Remove(rm) (Concepts)
+
+* cp, mv and rm can act on either files, or directories
+ ```shell
+ cp file1 file2
+ mv file1 file2
+
+ cp -R dir1 new/location
+ mv dir1 new/location
+
+ cp file1 file2 ... some/existing/dir
+ mv file1 file2 ... some/existing/dir
+
+ rm file1 ...
+ rm -R dir
+ rm -Rf dir # Danger!
+ ```
+
+* Effectiveness of these commands greatly improved by file patterns
+ - *, ., [0-9],[ABC], {}, etc
diff --git a/2020/2020-02-15_gnuLinuxCourse/slides/shell/effective-cmd-editing-concepts.md b/2020/2020-02-15_gnuLinuxCourse/slides/shell/effective-cmd-editing-concepts.md
new file mode 100644
index 0000000000000000000000000000000000000000..7cf129fa239fe45f00269da04539f0df6fa5b223
--- /dev/null
+++ b/2020/2020-02-15_gnuLinuxCourse/slides/shell/effective-cmd-editing-concepts.md
@@ -0,0 +1,15 @@
+# File Explorer: Effective Command Line Editing (Concepts)
+
+* Moving using arrow keys is tedious
+
+* Retyping commands that contain a typo is even more tedious
+
+* *Readline* facility of the bash shell offers quicker navigation
+ - Move by a word left and right using `Ctrl`+`Left`, or `Right`
+ - Move to a beginning, or the end of the line using `Ctrl`+`A` and `Ctrl`+`E`
+ - Delete an entire word using `Alt`+`D`
+ - Paste a deleted word with `Ctrl`+`Y`
+
+* Reuse previous commands!
+ - The shell remembers what you type
+ - Move to a previous line in history using `Up` and `Down` arrows
diff --git a/2020/2020-02-15_gnuLinuxCourse/slides/shell/effective-cmd-editing.md b/2020/2020-02-15_gnuLinuxCourse/slides/shell/effective-cmd-editing.md
index 2590bdd914ff33bd99d48e198b24dc3682324303..b4734d3ac9d236f5b94bafa757b6de1db2302ee0 100644
--- a/2020/2020-02-15_gnuLinuxCourse/slides/shell/effective-cmd-editing.md
+++ b/2020/2020-02-15_gnuLinuxCourse/slides/shell/effective-cmd-editing.md
@@ -1,4 +1,4 @@
-# Practical: Effective Command Line Editing
+# File Explorer: Effective Command Line Editing
```console
$ # Move up the history list until 'mkdir linux-practical-01'.
@@ -17,16 +17,9 @@ $ touch subdir-02/a subdir-02/b subdir-02/c
$ history 10 # Lists last ten commands.
$ cd
```
-
<!-- * Motions -->
<!-- - `Left` and `Right` arrow move one character left, or right -->
<!-- - `Ctrl` + `Left`, or `Right` move left, or right for one word -->
<!-- - `Ctrl` + `A`, or `E` move to the beginning, or the end of the line -->
<!-- - `Up` and `Down` move through history entries -->
<!-- - `TAB` completes -->
-
-
-
-
-
-
diff --git a/2020/2020-02-15_gnuLinuxCourse/slides/shell/file-explorer-basic-concepts.md b/2020/2020-02-15_gnuLinuxCourse/slides/shell/file-explorer-basic-concepts.md
new file mode 100644
index 0000000000000000000000000000000000000000..7723a20d4d2d9ddd28218e1630e817fa3b09894f
--- /dev/null
+++ b/2020/2020-02-15_gnuLinuxCourse/slides/shell/file-explorer-basic-concepts.md
@@ -0,0 +1,14 @@
+# File Explorer: Basics (Concepts)
+
+* While interacting with a shell, we are always in a given *working directory*
+* Data is organised into directories and files, like on other systems.
+* Location of a file in respect to the current directory is given by a (*relative*) file path
+ - some/dir/with/a/file
+
+* New commands:
+ - `pwd` : outputs the current working directory
+ - `ls [-lhd ... file1 file2 file3 ...]` : lists files
+ - `cd path/to/existing/dir` : change current directory to a new directory
+ - `mkdir [-p] path/to/new/dir` : creates a new directory
+ - `touch file1 [file2 file3 ...]` : creates an empty file.
+ - `history` : view the list of commands executed so far
diff --git a/2020/2020-02-15_gnuLinuxCourse/slides/shell/file-explorer-basic.md b/2020/2020-02-15_gnuLinuxCourse/slides/shell/file-explorer-basic.md
new file mode 100644
index 0000000000000000000000000000000000000000..24154e32e2fa7d0fbb2603774401c6f148d96010
--- /dev/null
+++ b/2020/2020-02-15_gnuLinuxCourse/slides/shell/file-explorer-basic.md
@@ -0,0 +1,21 @@
+# File Explorer: Basics
+```console
+$ pwd # Displays the absolute path to the current dirrectory.
+$ ls # List contents of the current directory.
+$ mkdir linux-practical-01 # Create a new directory.
+$ cd linux-practical-01 # Switch to a different directory.
+$ touch pr1-hello-world.txt # Create a new and empty file.
+$ mkdir subdir-01 # Create another directory.
+$ touch subdir-01/a subdir-01/b subdir-01/c # Create multiple empty files.
+$ ls subdir-01 # List contents of directory.
+$ mkdir -p subdir-02/dir-X/dir-Y/dir-Z # Create a nested directory under the path.
+$ ls subdir-02/dir-X # Confirm the directory dir-Y has been created.
+$ history # Lists the commands executed so far.
+$ cd
+```
+
+<!-- * Concepts -->
+<!-- - Files and directories -->
+<!-- - Paths -->
+<!-- - Importance of quoting -->
+<!-- - History -->
diff --git a/2020/2020-02-15_gnuLinuxCourse/slides/shell/start.md b/2020/2020-02-15_gnuLinuxCourse/slides/shell/start.md
index 1321b4f48f2d88ade8059685ccfee626cecdfb49..e36cb9d2453e0a418a663e152d4b499a6c678ad0 100644
--- a/2020/2020-02-15_gnuLinuxCourse/slides/shell/start.md
+++ b/2020/2020-02-15_gnuLinuxCourse/slides/shell/start.md
@@ -1,36 +1,16 @@
-# File Explorer: The Immediate Surroundings
+# Command Line
-* Command line
- - **Command prompt:** Non-editable; May provide contextual information
- - **Command area:** Typed commands are shown here
- - **RETURN or ENTER:** Pressing this key will execute the command
- ```shell
- prompt$ command arg1 arg2 ...
- ```
-
-<!-- .element: class="fragment" -->
- ```console
- $ pwd # Displays the absolute path to the current dirrectory.
- $ ls # List contents of the current directory.
- $ mkdir linux-practical-01 # Create a new directory.
- $ cd linux-practical-01 # Switch to a different directory.
- $ touch pr1-hello-world.txt # Create a new and empty file.
- $ mkdir subdir-01 # Create another directory.
- $ touch subdir-01/a subdir-01/b subdir-01/c # Create multiple empty files.
- $ ls subdir-01 # List contents of directory.
- $ mkdir -p subdir-02/dir-X/dir-Y/dir-Z # Create a nested directory under the path.
- $ ls subdir-02/dir-X # Confirm the directory dir-Y has been created.
- $ history # Lists the commands executed so far.
- $ cd
- ```
-<!-- .element: class="fragment" -->
-<!-- * Concepts -->
-<!-- - Files and directories -->
-<!-- - Paths -->
-<!-- - Importance of quoting -->
-<!-- - History -->
-
+* **Command prompt:** Non-editable; May provide contextual information
+* **Command area:** Typed commands are shown here
+* **RETURN or ENTER:** Pressing this key will execute the command
-
-
+* General form of the commands
+ ```shell
+ prompt$ ls
+ prompt$ ls -a
+ prompt$ ls --help
+ prompt$ rsync -avz /path/to/file/a /path/to/file/b
+ prompt$ make -j8
+ prompt$ gfortran -c -mtune=native
+ ```