Connect GitHub using openssh

Add new ssh key

ssh-keygen -t ed25519 -C "youremail@example.com"

$ ssh-keygen -t ed25519 -C "youremail@example.com"
Generating public/private ed25519 key pair.
Enter file in which to save the key (/home/username/.ssh/id_ed25519):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/username/.ssh/id_ed25519
Your public key has been saved in /home/username/.ssh/id_ed25519.pub
The key fingerprint is:
SHA256:myLr0FO3JEIwZGAP74SZ1f82WHxuzsCakb5xdaHVYpQ youremailp@example.com
The key's randomart image is:
+--[ED25519 256]--+
|.==..        ..  |
|..Oo .      .E.  |
| + +. . .    = . |
|  o.   . o .+ o  |
|   .. o S oo .   |
|   . o B X.o.    |
|  . + o.O.*      |
|   . + =o  o     |
|   .o  ..        |
+----[SHA256]-----+

TIP

passphrase can be ignored.

Add ssh key to ssh-agent

eval "$(ssh-agent -s)"

$ eval "$(ssh-agent -s)"
Agent pid 55041

TIP

For some shell, it may not be able to execute this command correctly(fish for example), for that case, use bash instead.

ssh-add ~/.ssh/id_ed25519 # replace id_25519 with actual name

Check existing ssh keys

ls -al ~/.ssh

Add ssh key to your GitHub account

TIP

See: Adding a new SSH key to your GitHub account

Test your ssh connection

ssh -T git@github.com

$ ssh -T git@github.com
Hi github_username! You've successfully authenticated, but GitHub does not provide shell access.

Congratulations! Your ssh connection has successfully set up.

If you see somthing like this which means you did something wrong.

...
Agent admitted failure to sign using the key.
debug1: No more authentication methods to try.
Permission denied (publickey).