ssh command

ssh is a Unix command used for remotely connecting to other servers using SSH protocol. ssh is sometimes called the ssh client component, while sshd is the server component of SSH software.

For a comprehensive overview, see the SSH Reference.

The simplest use is to invoke ssh command with a single parameter which is a remote server’s hostname or IP address:

{% highlight command %} greys@maverick:~ $ ssh vps1.unixtutorial.org Last login: Fri Oct 5 11:59:37 2018 from 212.129.78.186 greys@vps1:~$ {% endhighlight %}

Default port for SSH service is 22, but it’s possible to change it so you may have to specify it as an option for the ssh command:

{% highlight command %} greys@maverick:~ $ ssh -p 212 s3 Last login: Thu Oct 4 13:41:11 2018 from 212.129.78.20 CentOS Linux release 7.2.1511 (Core) [greys@s3 ~]$ {% endhighlight %}

See Also

SSH Basics

• basic Unix commands
• Unix Commands
• SSH Reference
• SSH command

SSH Keys & Authentication

• How To: Generate SSH Key
• How To: Generate ed25519 SSH key
• How To: Change SSH key passphrase
• How To: Inspect SSH key fingerprints
• How To: Find SSH key using Fingerprint
• Project: Upgrading RSA keys to Ed25519
• SSH Agent and How to Use It
• Deploy Your SSH key To Remote Server

Passwordless SSH

• Passwordless SSH
• Passwordless SSH with encrypted homedir in Ubuntu

SSH Port & Configuration

• SSH port
• SSH port forwarding
• How To: Check SSH Port Status
• Test SSHd config on a different SSH port
• Using Multiple SSH Ports
• Most Important sshd Configuration Options
• Ubuntu SSH: How To Enable Secure Shell in Ubuntu

Troubleshooting

• SSH - Too many authentication failures
• SSH: Bad configuration option: usekeychain

Advanced Topics

• Important SSH server configuration options
• Using multiple SSH ports
• How To: Check SSH key fingerprint
• Unix Reference
• id – print user identity