started lec 1 and lec 2 notes

_subsections/lesson-01.org

@@ -0,0 +1,105 @@
+#+title: Lesson 01 | Course Overview + Shell
+#+HTML_HEAD: <link rel="stylesheet" type="text/css" href="../_share/media/css/missing-semester.css" />
+#+HTML_HEAD: <link rel="stylesheet" type="text/css" href="../_share/media/css/org-media-sass/collapsible.css" />
+#+HTML_HEAD: <script src="../_share/media/js/collapsible.js"></script>
+
+* Links
+#+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
+
+* Notes
+** why
+- there are many tools that make life easier for programmers
+- lecture notes and recordings are available online
+
+** the shell
+- programs are meant to be integrates with each other through the shell
+- most common shell is Bourne Again Shell (bash)
+
+** shell prompt
+- typical shell prompt:
+        #+attr_html: :width 300px
+        file:../_share/media/img/lecture01/ex01.png
+
+- shells can be customized extensibly
+- arguments are seperated by whitespace
+- multiple words can be passed as a single argument via:
+  - quotes
+    #+begin_src bash
+    echo "Hello world"
+    #+end_src
+
+  - escapes
+    #+begin_src bash
+    echo Hello\ world
+    #+end_src
+
+** how does the shell know where programs are
+- via environment variable
+  - things that are set whenever you start your shell
+    - where is your home directory
+    - what is your username
+    - what are the PATHs to your programs
+- shells, and bash in particular, are programming languages
+
+** paths
+*** PATH environment variable
+
+- a list seperated by colons (:)
+- when bash is asked to run a program bash will search through the directories in path until it finds the program
+
+*** absolute vs relative path
+
+- pwd: print working directory
+- all relative paths are relative to your current working directory
+- absolute path starts with '/'
+
+*** special directories
+- '.' current directory
+- '..' parent directory
+
+*** tilde (~)
+- always expands to your home directory
+
+*** dash (-)
+- toggles to the previous directory you were at
+
+  #+begin_src bash
+  cd /home/ronny/programs/notes/courses
+  cd ../../
+  cd -
+  pwd
+  #+end_src
+
+the output will be
+=/home/ronny/programs/notes/courses=
+
+
+*** Playlist
+
+#+attr_html: :class playlist
+- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=20s][00:20 why we're doing this class]]
+- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=251s][04:11 the shell]]
+- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=338s][05:38 install a terminal and a shell]]
+- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=364s][06:05 the shell prompt]]
+- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=411s][06:51 shell prompt]]
+- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=522s][08:42 how does the shell know what these programs are]]
+- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=672s][11:12 paths]]
+- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=738s][12:18 absolute path]]
+- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=759s][12:39 relative paths]]
+- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=1034s][17:14 tilde character]]
+- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=1336s][22:16 directories]]
+- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=1376s][22:56 execute on directories]]
+- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=1514s][25:14 cp command]]
+- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=1547s][25:47 rm]]
+- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=1590s][26:30 create a new directory]]
+- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=1912s][31:52 pipe character]]
+- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=2044s][34:04 grep]]
+- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=2145s][35:45 the root user]]
+- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=2239s][37:19 kernel paramters]]
+- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=2612s][43:32 scroll lock led]]
+- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=2706s][45:06 open a file]]
+- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=2829s][47:09 lecture notes]]
+- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=2875s][office hours]]

_subsections/lesson-02.org

@@ -10,6 +10,48 @@
 
 * Notes
 
+** bash
+*** spaces are critical with bash
+  - this works:
+  #+begin_src bash
+  foo=bar
+  echo $foo
+  #+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=
+
+  - 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
+    #+begin_src bash
+    echo "Hello"
+    #+end_src
+    #+begin_src bash
+    echo 'Hello'
+    #+end_src
+
+- double quotes can interpolate variables
+  #+begin_src bash
+  echo "Value is $foo"
+  #+end_src
+
+  will return: =Value is bar=
+
+- single quotes can NOT interpoloate variables
+  #+begin_src bash
+  echo 'Value is $foo'
+  #+end_src
+
+  will return: =Value is $foo=
 
 *** Playlist
 

toc.org

@@ -11,8 +11,8 @@
 
 * Contents Overview
 #+attr_html: :class contents-overview
-- [[./_subsections/lesson-02.org][Lesson 01 | Course Overview + The Shell]]
-- [[./_subsections/lesson-03.org][Lesson 02 | Shell Tools and Scripting]]
+- [[./_subsections/lesson-01.org][Lesson 01 | Course Overview + The Shell]]
+- [[./_subsections/lesson-02.org][Lesson 02 | Shell Tools and Scripting]]
 
 *** Playlist