notes/compsci-missing_semester_2020
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ronny abraham 2024-12-12 18:30:39 +02:00
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1
_subsections/lesson-01.org
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@ -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:

76
_subsections/lesson-02.org
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@ -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