Skip to content

ssh.md

Latest commit

 

History

History
52 lines (39 loc) · 1.58 KB

ssh.md

File metadata and controls

52 lines (39 loc) · 1.58 KB

SSH

The ssh command in Linux is used to securely log into a remote machine and execute commands on it. SSH stands for Secure Shell, and it uses encryption to secure the connection between the client and the server.

Basic Syntax

ssh [user@]hostname [command]

Common Usage

Connecting to a Remote Server

ssh user@hostname

Note: Replace user by username of the server and hostname by IP address or Domain Name.

Running a Command on a Remote Server

ssh user@hostname 'command'

Example

ssh user@hostname 'ls -l /var/www'

This command lists the contents of the /var/www directory on the remote server.

Specify a Port

ssh -p port user@hostname

Note: This connects to the remote server using a specified port. By default, SSH uses port 22.

Using SSH Key

SSH keys provide a more secure way of logging into a remote server than using a password. To use SSH keys, you need to generate a key pair and place the public key on the server.

ssh-keygen
ssh-copy-id user@hostname
ssh user@hostname

Key Options

  • -i identity_file: Specifies an identity (private key) file to use for public key authentication.
  • -L [bind_address:]port:host:hostport: Specifies that the given port on the local (client) host is to be forwarded to the given host and port on the remote side.
  • -R [bind_address:]port:host:hostport: Specifies that the given port on the remote (server) host is to be forwarded to the given host and port on the local side.
  • -X: Enables X11 forwarding.
  • -C: Requests compression of all data.