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ssh-keygen

Generate ssh-keygen commands for common SSH key tasks

Build ssh-keygen commands for creating keys, converting PEM, changing passphrases, checking fingerprints, and removing stale known_hosts entries.

Choose a task, adjust the options, and copy the exact command you need.

Task

Create a new SSH key pair with your preferred algorithm and file path.

Command options

Generated command

Copy the command and run it locally in Terminal.

ssh-keygen -t ed25519 -C "[email protected]" -f ~/.ssh/id_ed25519

After generating the command, manage the connection workflow in DartShell

Keep your SSH hosts, file transfer, and database access together after the key setup step is done.

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What this ssh-keygen tool helps with

Create the right command faster

Instead of searching for flags every time, choose a task and copy a command that already includes the common options.

Handle PEM and legacy compatibility

Some platforms still expect PEM output, especially when they document RSA-based SSH onboarding flows.

Fix host key mismatch warnings

Use the known_hosts cleanup command when SSH warns that a remote host identification has changed.

Common ssh-keygen examples

Create a modern Ed25519 key

ssh-keygen -t ed25519 -C "[email protected]" -f ~/.ssh/id_ed25519

Create an RSA 4096 key in PEM format

ssh-keygen -t rsa -b 4096 -m PEM -C "[email protected]" -f ~/.ssh/id_rsa

Remove an outdated known_hosts entry

ssh-keygen -R github.com