There are several ways to use a different SSH key when pulling from Git:

1. Using the -i flag:

• Specify the desired key file directly in the Git command:

  git pull -i /path/to/your/key
  

2. Setting the GIT_SSH_COMMAND environment variable:

• Use this for a more permanent solution within the current terminal session:

  export GIT_SSH_COMMAND="ssh -i /path/to/your/key"
  git pull
  

3. Configuring the SSH config file (~/.ssh/config):

• Create aliases for different SSH hosts and keys:

  Host work
     Hostname github.com
     IdentityFile ~/.ssh/work_key
  
  Host personal
     Hostname github.com
     IdentityFile ~/.ssh/personal_key
  

• Use the alias in Git commands:

  git pull work:username/repo.git
  

4. Configuring Git's core.sshCommand:

• Customize SSH commands for specific repositories:

  git config core.sshCommand "ssh -i /path/to/your/key"
  git pull
  

Key points to remember:

• Key generation: If you don't have a separate key, generate one using ssh-keygen.
• Public key addition: Add the public key to your Git service account (e.g., GitHub, GitLab).
• Multiple keys: Manage multiple keys effectively using the SSH config file for organization.
• Preferred method: Choose the method that best suits your workflow and preferences.

Additional tips:

• Use the ssh-add command to load keys into the SSH agent for easier management.
• Consider using a password manager to securely store SSH key passphrases.