Check SSH connection

Below are the steps to verify that our system is successfully authenticated using ssh

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Command : pgrep -l ssh-agent

• pgrep: A command-line utility used to find and list processes based on their name.

  • p: Stands for "process."

  • grep: Stands for "global regular expression print." In this context, it searches for processes.

• -l: A flag that tells pgrep to list the process name alongside the process ID (PID).

  • Example: Output will look like 12345 ssh-agent.

• ssh-agent: The name of the process we are searching for. It manages private keys and helps with SSH authentication.

Purpose: This checks if the ssh-agent process is running and displays its PID and name if found.

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Command : eval "$(ssh-agent -s)"

• eval: A shell command that evaluates the arguments as a shell command. It processes the result as if it was directly typed in the terminal.

  • Purpose: To execute the output of a command dynamically.

• $(): Command substitution. It runs the command inside the parentheses and replaces it with the output.

  • Inside $():

    • ssh-agent: Starts the SSH authentication agent.

    • -s: Outputs environment variables in a shell-friendly format. These variables are essential for the SSH client to communicate with the agent.

• Result: Sets up the SSH_AUTH_SOCK and SSH_AGENT_PID environment variables so that the shell can interact with the ssh-agent.

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Command : ssh-add ~/.ssh/myGitHubProjects/id_rsa_sj_github

• ssh-add: Adds a private key to the running ssh-agent for authentication.

  • Purpose: Enables the agent to manage this key, allowing you to use SSH without re-entering the passphrase repeatedly.

• ~: Represents the home directory of the current user.

• /.ssh/myGitHubProjects/: A path to the directory where SSH keys are stored. This is specific to your setup.

• id_rsa_sj_github: The private key file for your GitHub project. Private keys are used for authenticating with Git servers.

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Command : ssh-add -l

• ssh-add: Same as above but used with a different flag.

• -l: Lists all the identities (keys) currently managed by the ssh-agent.

  • Output: Displays the public key fingerprint and comment for each key.

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Command : ssh -T [email protected]

• ssh: Secure Shell protocol used for secure communication between systems.

• -T: Disables the pseudo-terminal allocation.

  • Purpose: Prevents interactive login since we are testing authentication.

• [email protected]: The SSH username and hostname of the GitHub server.

  • git: The default user for GitHub SSH connections.

  • github.com: The hostname of GitHub.

Purpose: Tests whether the SSH connection to GitHub is successful.

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Command : git clone [email protected]:sv10joshi/ComposePlayground.git

• git: The Git version control system command.

• clone: A Git subcommand to copy a repository from a remote source to your local machine.

• [email protected]:: Specifies the SSH protocol and repository host. It follows the format user@host:.

  • git: The SSH user.

  • github.com: The hostname of the GitHub server.

  • :: Separates the host from the repository path.

• sv10joshi/ComposePlayground.git: The repository to be cloned.

  • sv10joshi: The GitHub username or organization name owning the repository.

  • ComposePlayground.git: The specific repository name, with .git indicating it is a Git repository.

• please: (Optional, not part of the actual command): The local directory where the repository will be cloned. This is specific to your setup.

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Would you like me to expand on any specific part, or was this detailed enough?