Create key and add it to github

Create ssh key:

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

Add your key to agent:

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ssh-add ~/.ssh/elvinguti_key

Add key to github.

Update config

Update ~/.ssh/config:

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Host github.com
  HostName github.com
  IdentityFile ~/.ssh/my_work_key
  IdentitiesOnly yes

Host elvinguti.github.com
  HostName github.com
  User elvinguti
  IdentityFile ~/.ssh/elvinguti_key
  IdentitiesOnly yes

you might need to restart the ssh-agent:

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eval $(ssh-agent -s)

Then you should be able to clone a repo or update the git remote url:

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# URL Format: git@host_alias:user/repo_name.git

# Existing repo
git remote set-url origin git@elvinguti.github.com:elvinguti/elvingutidev.git`

# Clone repo
git clone origin git@elvinguti.github.com:elvinguti/elvingutidev.git