musaibdeveloper

Backend Crash Course


I - Setup 
////////////////////////////////////////////
1. Create Repo In GitHub With Your Project Name (Check README.md)
2. Get On Your Terminal 
3. cd 
4. git clone git@github.com{PROJECT_SSH_URL}
5. cd RepoName

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HOW TO STRUCTURE YOUR BACKEND CODE IN NODE.JS(express.js).

  📁
  ├── 📄 app.js
  ├── 📁 bin
  ├── 📁 config
  ├── 📁 controllers
  │   ├── 📄 customer.js
  │   ├── 📄 product.js
  │   └── ...

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Method 1
 1. go to github.com..Click on your repos and make a new repository
1.1 give a name
1.2 select public or private
1.3 check on add readMe and click create new repo

 2. copy the ssh code
 3. go to your terminal
     git clone sshcode -> to clone your terminal with repository 
 4. cd reponame -> to go inside the repo and to create files or folders

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Cron Job 


A Cron Job is a Linux command for scheduling a task (command). Cron Jobs allow you to automate specific commands or scripts on your server to complete repetitive tasks automatically.

Cron Job is of two types 
1. Time based 
2. Interval Based 

1.1 Time based is on Alarm which is one time completed 

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 Linux Basic Commands 

Package installation
Sudo apt install packagename.
Python3 -m http.server 8080 (for converting the machine into web server).

Ifconfig for IP address
Softlink(ln -s filename)
Hardlink(ln filename)

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 Linux Basic Commands

move mv
copy cp 
rename mv name and new name
touch
hidden file show command ls -a 
echo
nano
htop

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Introduction to Number System 
It is a way of representing nos in different types.
Types in number system are:
1) Decimal NS (10):
0,1,2,3,4,5,6,7,8,9
2) Binary NS (2):
0,1
3) Octal NS (8):
0,1,2,3,4,5,6,7
4) Hexadecimal NS (16):

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SSH Keygen Command

ssh-keygen -t ed25519 -C "GITHUB EMAIL YOURS"
Press 3 times enter then

cd 
cd .ssh
cat id_ed25519.pub
Copy the public key and paste in 
GitHub ==> Settings ==> SSH and GPG Keys ==> Add New SSH Key