Special Gift from Github! + Linux Basics

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# A Special Gift for Bio2020 Class

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# Git cheat sheets

[{PDF}](https://education.github.com/git-cheat-sheet-education.pdf)

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# GitHub Flow guide

[{PDF}](https://enterprise.github.com/downloads/en/github-flow-cheatsheet.pdf)

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# GitHub-Flavored Markdown guide

[{PDF}](https://enterprise.github.com/downloads/en/markdown-cheatsheet.pdf)

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# GitHub for Robotics comic book 
#### explains the basics of using GitHub

[{CBR}](https://discourse-cdn-sjc2.com/standard16/uploads/github/original/2X/1/175452fc42e0a4e34b0dd52d4c923ab47fd1619f.cbr)

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# How to show gratitude!
### [{#ThanksGitHub}](https://twitter.com/hashtag/thanksgithub?f=tweets&vertical=default&src=hash)

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## Mates from US
<img style="width:70%" src="/gallery/thanks-gh.png">

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## Mates from Japan
<img style="width:70%" src="/gallery/thanks-gh.jpeg">

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## Special Gifts for Best Students

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## Linux Spaces
### System-wise space vs. User space

* When working on your projects, you are a **USER**.
* When installing/upgrading system-wise application/library, you are an **ADMIN**.

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## Jumping between folders (changing directories)

```terminal
$ cd (Relative Path|Absolute Path)
```

* In terminal commands, with `A|B`, I mean "Either A or B".

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## Listing files in the current directory (folder)

### List files/directories inside the current directory of the terminal
```terminal
$ ls 
```

### List files/directories on from other directory
```terminal
$ ls (Relative Path|Relative Path)
```

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## Change folder name or moving folder name

```terminal
$ mv (file|directory) (new file|new directory)
```

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## Copy file

```terminal 
$ cp (file) (target path)
```

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## Copy directory

```terminal
$ cp -r (directory) (target path)
```

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## Create a new directory (folder)

```terminal
$ mkdir (new folder name)
```

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## Removing a file

```terminal
$ rm (file)
```

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## Remove a directory

```terminal
$ rm -r (directory)
```

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## WARNING: Did you say `rm`?

### HOW ABOUT `sudo rm -rf /`

DO NOT DO THIS!
```terminal
$ sudo rm -rf /
```

--
<img style="width:80%" src="/gallery/bomb.jpg">

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## Updating & Upgrading your Linux

Upgrades are very important. Many hardware drivers issues are being fixed through these updates. Also, security-wise,
updates guarantees your system to be safe against hackable vulnerabilities. For example, *Spectre* and *Meltdown* vulnerabilities that exposed all
 Operating Systems (including Widnows and Linux), for more [info](https://www.pcworld.com/article/3245606/security/intel-x86-cpu-kernel-bug-faq-how-it-affects-pc-mac.html).

```terminal
$ sudo apt-get update
$ sudo apt-get upgrade
```

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## Installing packages from the apt store

```terminal
$ sudo apt-get install (package name)
```

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## Installing local `.deb` packages

```terminal
$ sudo dpkg -i (package path)
```

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## Interesting Appliactions

| Category | package name | 
|----------|--------------|
| Music & Video | vlc, rhythm box (shipped with Ubuntu) |
| PDFs | Okular, Foxit, PdfShuffler |
| Screenshots | Shutter | 
| C++ IDEs | Qt Creator, Jet-brains CLion, VSCode |
| Python IDEs | Pycharm, Anaconda (Spyder) |
| Web IDEs | VSCode, Jet-brains WebStorm |

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## Practice: same logic with different constructs

```c++

double calculation( double a , double b , char operation )
{
  if( operation == '+' )
  {
    return a + b;
  }
  else if( operation == '-' )
  {
    return a - b;
  }
  else if( operation == '*' )
  {
    return a * b;
  }
  else if( operation == '/' )
  {
    return a / b;
  }
  else
  {
    return 0;
  }
}
```

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```c++
double calculation( double a , double b , char operation )
{
  switch( operation )
  {
    case '+' :
    {
      return a + b;
    } break;

case '-':
    {
      return a - b;
    } break;

case '*':
    {
      return a * b;
    } break;

case '/':
    {
      return a / b;
    } break;

default:
    {
      return 0;
    }
  }
}
```
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Thanks for Mostafa Hisham and Emmanuel for solving this problem!