completed ssh sec, added git

_subsections/lesson-05.org

@@ -289,3 +289,57 @@ you can find good alias lists online
    ├─ bashrc
    └─ vimrc
 #+end_src
+
+** ssh
+- working with remote machines
+- it is good for opening connections
+- can execute commands remotely, and piping back the output to the calling shell
+  ~ssh username@some-ip.com ls -la~
+
+** ssh keys
+- typing passwords is inconvenient
+- use public key encryption
+  - public, private
+  - give public key to the server
+  - whenever you try to authenticate use your private key
+
+*** create a key
+~ssh-keygen -o -a -t ed25519~
+
+- passphrase gives extra protection bc a user of the private key has to give a password
+
+- creates
+  - private key: id_ed25518
+  - public key: id_ed25519.pub
+
+*** move the public key to the server
+#+begin_src bash
+cat ~/.ssh/id_ed25519.pub | ssh username@ip-address.com tee .ssh/authorized_keys
+#+end_src
+
+- at that point ssh will ask you for the password for the server and then it will put the key where you sent it
+- 'tee' sends standard input both to the screen and to a file (so you can see what is being saved)
+
+**** ssh-copy-id
+- does the above but in one command
+~ssh-copy-id username@ip-address~
+
+
+** copy files remotely
+*** scp
+~scp filename.ext username@ip-address:/path/to/new-filename.ext~
+
+*** rsync
+- copy a LOT of files remotely
+- rsync can continue from interrupts
+
+
+~rsync -avP /folder/to/copy/from username@ip-address:/folder/to/copy/to~
+
+** ssh config
+
+Host hostname
+  User username
+  HostName ip-address
+  IdentityFile ~/.ssh/id_ed25519
+  RemoteForward 9999 localhost:8888

_subsections/lesson-06.org

@@ -0,0 +1,34 @@
+#+title: Lesson 06 | Version Control (git)
+#+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>
+#+OPTIONS: H:6
+
+* Links
+#+attr_html: :class links
+- [[../toc.org][TOC | Missing Semester]]
+- [[https://www.youtube.com/playlist?list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J][Playlist: Missing Semester]]
+- [[https://www.youtube.com/redirect?event=video_description&redir_token=QUFFLUhqbFlfYnViTXFoZm9UUXlSVVJEU0VFUkNKZ3BXd3xBQ3Jtc0tuVlVvNktsdnI1Tlh2NlYtUGpteFRWZE03R2dzRTdldklNZldKaVh4REtTNzRYcUJheXV6S3ZuQWV6c2x0RzhRYjdmMmdhWXVwamt2TWRPYkd3cW8yTFBJNEpJYVc1elFCX09mdDgxRlc3bW50UjlVQQ&q=https%3A%2F%2Fmissing.csail.mit.edu%2F2020%2Fversion-control%2F&v=2sjqTHE0zok][class notes]]
+
+- Curr: https://youtu.be/2sjqTHE0zok?si=--BTpZVvln-Og5t0
+
+*** timestamps
+:PROPERTIES:
+:CUSTOM_ID: timestamp
+:END:
+
+#+attr_html: :class playlist
++ [[https://www.youtube.com/watch?v=2sjqTHE0zok][00:00 - Office Hours]]
++ [[https://www.youtube.com/watch?v=2sjqTHE0zok&t=48s][00:48 - Version Control Systems]]
++ [[https://www.youtube.com/watch?v=2sjqTHE0zok&t=415s][06:55 - Adhoc Version Control]]
++ [[https://www.youtube.com/watch?v=2sjqTHE0zok&t=470s][07:50 - Git Models]]
++ [[https://www.youtube.com/watch?v=2sjqTHE0zok&t=900s&pp=0gcJCd0CDuyUWbzu][15:00 - Data Structure]]
++ [[https://www.youtube.com/watch?v=2sjqTHE0zok&t=1502s][25:02 - Questions]]
++ [[https://www.youtube.com/watch?v=2sjqTHE0zok&t=1587s][26:27 - Demo]]
++ [[https://www.youtube.com/watch?v=2sjqTHE0zok&t=1755s][29:15 - Staging Area]]
++ [[https://www.youtube.com/watch?v=2sjqTHE0zok&t=2092s][34:52 - Git Log]]
++ [[https://www.youtube.com/watch?v=2sjqTHE0zok&t=2826s][47:06 - Branching Merge]]
++ [[https://www.youtube.com/watch?v=2sjqTHE0zok&t=3008s][50:08 - Branching Cat]]
++ [[https://www.youtube.com/watch?v=2sjqTHE0zok&t=3177s][52:57 - Branching Dog]]
+
+* notes

toc.org

@@ -34,3 +34,4 @@
 - [[./_subsections/lesson-03.org][Lesson 03 | Editors (vim)]]
 - [[./_subsections/lesson-04.org][Lesson 04 | Data Wrangling]]
 - [[./_subsections/lesson-05.org][Lesson 05 | Command-line Environment]]
+- [[./_subsections/lesson-06.org][Lesson 06 | Version Control (git)]]