How to check the SSH version in Linux system

How to check the SSH version in Linux system

SSH (Secure Shell) is an encrypted remote connection protocol that is widely used in Linux systems. It is very important to understand the SSH version in the current system, because different versions may have different security vulnerabilities or functional features. In this article, we will introduce how to check the SSH version in a Linux system and provide specific code examples.

First, we can check the SSH version in the system through the command line. The following are some commonly used commands:

1. Use the ssh command to connect to the remote host and view the SSH version information:

ssh -V

This command will display the SSH version number, for example:

OpenSSH_8.2p1 Ubuntu-4ubuntu0.1, OpenSSL 1.1.1f  31 Mar 2020

2. Use the dpkg command to view the version information of the OpenSSH software package:

dpkg -l | grep openssh

This command will list the version information of the OpenSSH software package installed in the system, for example:

ii  openssh-client    1:8.2p1-4ubuntu0.1     amd64        secure shell (SSH) client, for secure access to remote machines
ii  openssh-server    1:8.2p1-4ubuntu0.1     amd64        secure shell (SSH) server, for secure access from remote machines

3. Use the ssh-keygen command to view local SSH key information:

ssh-keygen -l -f /path/to/ssh_key

This command will list the version and public key fingerprint information of the specified SSH key. For example:

4096 SHA256:L7X8gUBZsK9odkxRwJY0sXqFnsW2m59UuJzNFZiVQj8 user@example.com (RSA)

Through the above commands, we can easily check the version information of SSH in the Linux system. For systems with high security requirements, it is very important to regularly check the SSH version and update it in time to ensure the security and stability of the system.

The above is the detailed content of How to check the SSH version in Linux system. For more information, please follow other related articles on the PHP Chinese website!