added changes to curr time, and shellcheck

_subsections/lesson-02.org

@@ -8,7 +8,7 @@
 - [[../toc.org][TOC | Missing Semester]]
 - [[https://www.youtube.com/playlist?list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J][Playlist: Missing Semester]]
 
-- Curr: https://youtu.be/kgII-YWo3Zw?si=Hy3Vic8blG1mOc7F&t=1357
+- Curr: https://youtu.be/kgII-YWo3Zw?si=Wm8KLT1ggOGG8W-g&t=1692
 
 
 *** timestamps
@@ -27,8 +27,8 @@
 + [[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]] *current*
++ [[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=1707s][28:27 - man command]] *current*
 + [[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]]
@@ -253,3 +253,30 @@ this takes the format {1..20}
 #+begin_src bash
 touch directory{1..4}/foo{a..z}.txt
 #+end_src
+
+** python scripts
+*** making them bash executable
+- reference the python compiler at the top of the file
+  - do it directly:
+        #+begin_src bash
+         #!/usr/local/bin/python
+        #+end_src
+ - use the env program to do so
+        #+begin_src bash
+          #!/usr/bin/env python
+        #+end_src
+
+*** args can be found through sys.argv[1:]
+  #+begin_src python
+import sys
+for arg in reversed(sys.argv[1:]):
+    print(arg)
+  #+end_src
+
+** checking for problems in bash scripts using 'shellcheck'
+#+begin_src bash
+shellcheck some_bash_script.sh
+#+end_src
+
+- will tell you problems
+- and warnings