EECS 201 - Class 1: Getting started

# Overview
1. Announcements
2. Review
3. Q&A
4. Extras
5. Basic assignment
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# Announcements
* Basic - Intro released!
  * Due at the end of January 31
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# Review
### What is a terminal?
* I/O device/peripheral
* Sends text to a computer
* Receives text from computer to display
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### What is a shell?
* Program that the user goes through to interact with the OS
* Graphical and command line varieties
* Command line shells interpret user-entered text and do something with it
  * Navigate through files and directories
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# Review
### File paths
* Describe how to get to a file/directory by traversing directories
* `/` is the directory separator
* "Root" is the highest level/topmost directory
* Absolute paths: start with a `/`
* Relative paths: don't start with a `/`
  * Implicitly start from the current directory
--

* "Special" directories
  * Each directory contains these
  * `.` leads to the same directory
  * `..` leads to the parent of the directory
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# Review
### Basic commands
* `man`: "manual pages"
* `pwd`: "print working directory"
* `ls`: "list directory"
* `cd`: "change directory"
* `mv`: "move"
* `cp`: "copy"
* `touch`
* `rm`: "remove"
* `cat`: "concatenate"
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# Review
### Command structure
```bash
$ <command> <argument 1> <argument 2> <argument 3>
^     ^    ^     ^
|     |    |     |-- programs are provided these to
|     |    |         interpret (remember argc and argv[]?)
|     |    |
|     |    |-- words separated by whitespace
|     |
|     |-- certain things are actual programs, certain things
|         are handled by the shell ("built-ins")
|
|-- this is called a "prompt" and can take many forms
```
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# Review
### Pipes and redirection
* `|` passes output from one command to the input of another
* `>` sends the output to a specified file instead of a terminal
* `<` reads input from a specified file instead of a terminal
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# Q&A
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# Extras
* Command line text editors
* Terminal pagers
* Shell scripts
* How WSL files work
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# Activity 1
* Count the number of items in a directory
  * `ls` will list out items in a directory
  * `wc -l` will count the number of lines of given _input_
  * `ls` will change its behavior to output items on lines when it's not printing to a terminal..
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# Activity 2
* Using only your terminal, create a Hello World program in C++ (or your preferred language)
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class: center, middle
# Basic assignment
* Create an SSH keypair
  * You can use an existing one
* Submit the keypair to the course server
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## Environment
* Terminal emulator: __Alacritty__
  * Former rxvt-unicode user until I learned how bad its font handling was
* Shell: __Zsh__
* Window manager: __i3-gaps__
* Compositor: __picom__
  * Does window transparency effects
* Notification server: __dunst__
  * Displays notifications

### Software
* Editor: __Vim__
* System monitoring: __htop__
* Notetaking: __Xournal++__