Change the default SSH port in Ubuntu, perform the following steps with root privileges:

1. Open the /etc/ssh/sshd_config file and locate the line:
   #Port 22
2. Then,add
   Port 2200
3. Restart the SSH server:
   

   sudo systemctl restart sshd

sudo adduser USERNAME

sudo usermod -aG sudo USER

• Click the file name in a GitHub
• Click Raw to display the file contents.
• You will see the file’s url link

In the command line, run

curl -OL https://raw.githubusercontent.com////path/to/file  (this is the file’s url link)

O means that curl downloads the content
L means that curl follows the redirection

To quit the vi editor without saving any changes you’ve made:

1.  press Esc.
2. Press : (colon).
3. Enter the following:
   q!
   This will quit the editor, and all changes you have made to the document will be lost.