From 21f0424e48c682e903b577d39ed5da90a87dcd66 Mon Sep 17 00:00:00 2001
From: ronny abraham <ronny.abraham@ymail.com>
Date: Thu, 12 Dec 2024 18:30:39 +0200
Subject: [PATCH] updates

---
 _subsections/lesson-01.org |  1 -
 _subsections/lesson-02.org | 76 ++++++++++++++++++++++++++++----------
 2 files changed, 56 insertions(+), 21 deletions(-)

diff --git a/_subsections/lesson-01.org b/_subsections/lesson-01.org
index b9c96a1..4640115 100644
--- a/_subsections/lesson-01.org
+++ b/_subsections/lesson-01.org
@@ -7,7 +7,6 @@
 #+attr_html: :class links
 - [[../toc.org][TOC | Missing Semester]]
 - [[https://www.youtube.com/playlist?list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J][Playlist: Missing Semester]]
-- current: https://youtu.be/Z56Jmr9Z34Q?si=t9wQkGXDznscDtNH&t=1217
 
 *** timestamps
 :PROPERTIES:
diff --git a/_subsections/lesson-02.org b/_subsections/lesson-02.org
index d2d9172..df952aa 100644
--- a/_subsections/lesson-02.org
+++ b/_subsections/lesson-02.org
@@ -14,22 +14,22 @@
 :END:
 
 #+attr_html: :class playlist
-1. [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=54s][control flow functions]]
-2. [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=227s][sequential execution]]
-3. [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=425s][standard input]]
-4. [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=444s][error code]]
-5. [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=517s][logical operators]]
-6. [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=603s][concatenate commands]]
-7. [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=645s][common substitution]]
-8. [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=675s][process substitution]]
-9. [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=935s][comparison operator]]
-10. [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=1173s][curly braces]]
-11. [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=1359s][python script]]
-12. [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=1707s][man command]]
-13. [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=2175s][finding files]]
-14. [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=2190s][grep]]
-15. [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=2573s][fuzzy finder]]
-16. [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=2649s][history substring search]]
++ [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=54s][00:54 - control flow functions]]
++ [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=227s][03:47 - sequential execution]]
++ [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=425s][07:05 - standard input]] *current*
++ [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=444s][07:24 - error code]]
++ [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=517s][08:37 - logical operators]]
++ [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=603s][10:03 - concatenate commands]]
++ [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=645s][10:45 - common substitution]]
++ [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=675s][11:15 - process substitution]]
++ [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=935s][15:35 - comparison operator]]
++ [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=1173s][19:33 - curly braces]]
++ [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=1359s][22:39 - python script]]
++ [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=1707s][28:27 - man command]]
++ [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=2175s][36:15 - finding files]]
++ [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=2190s][36:30 - grep]]
++ [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=2573s][42:53 - fuzzy finder]]
++ [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=2649s][44:09 - history substring search]]
 
 * Notes
 
@@ -42,16 +42,15 @@
   #+end_src
 
   - this doesn't:
-
   #+begin_src bash
   foo = bar
   echo $foo
   #+end_src
 
-  the output of that will be
-  =zsh: command not found: foo=
+    - the output of that will be
+     =zsh: command not found: foo=
 
-  - what happens in the above example is that we are effectively calling the "foo" program with the arguments: "=" and "bar"
+    - what happens in the above example is that we are effectively calling the "foo" program with the arguments: "=" and "bar"
 
 *** quotes
 - you can use double or single quotes to print a value
@@ -76,3 +75,40 @@
 
   will return: =Value is $foo=
 
+** sequential execution
+
+*** bash functions
+- mcd.sh
+#+begin_src bash
+mcd() {
+        mkdir -p "$1"
+        cd "$1"
+        }
+#+end_src bash
+
+- creates a function that can be executed after loading
+  - $1 is a global variable referring to the first parameter
+
+*** source
+- using source mcd.sh
+  =source mcd.sh=
+
+- then carry out the function
+  =mcd testdir=
+
+- this will create a new directory and cd into it as per the definied functioned
+
+*** variables
+- $0 -- name of the script we are currently in
+  - if you run this in the shell it will display 'bash'
+- $1->$9 -- the first through ninth argument given to a script
+- $? -- the last error message
+- $_ --- last argument of the previous call
+
+- !! -- recreates the last call with it's arguments
+  - use with sudo if you found your call needed a sudo and you don't feel like retyping it again
+
+ #+begin_src bash
+ ls -lah
+ sudo !!
+ #+end_src