Linux ssh Command

Linux 命令大全Complete Linux Commands

sshThe command is used to connect to a remote host via the SSH protocol for remote login and command execution. It encrypts all communication in the session, ensuring the security of data transmission.

SSH (Secure Shell) is an encrypted protocol used for remote login and communication between other network services. SSH provides a secure communication channel to protect the confidentiality and integrity of data.

Syntax

ssh [options] [user@]hostname [command]

Parameter Description

  • [user@]hostname: The username and hostname of the remote host to connect to.
  • [command]: An optional command to execute on the remote host.

Common Options

  • -l user: Specify the user to log in as.
  • -p port: Specify the port number to connect to the remote host, default is 22.
  • -i identity_file: Specify the identity authentication file (private key file).
  • -v: Verbose mode, displays debug information.
  • -C: Enable compression.
  • -N: Do not execute remote commands, only perform port forwarding.
  • -f: Run in the background.
  • -L local_port:remote_host:remote_port: Local port forwarding.
  • -R remote_port:local_host:local_port: Remote port forwarding.
  • -D [bind_address:]port: Dynamic application-level port forwarding.

Examples

Basic Usage

Connect to a remote host:

ssh user@hostname

Example:

ssh [email protected]

Connect with a specified port:

ssh -p 2222 user@hostname

Example:

ssh -p 2222 [email protected]

Use an authentication file:

ssh -i /path/to/private_key user@hostname
Example:
ssh -i ~/.ssh/id_rsa [email protected]

Execute a command on the remote host:

ssh user@hostname command

Example:

ssh [email protected] ls -la

Verbose mode:

ssh -v user@hostname

Example:

ssh -v [email protected]

Enable compression:

ssh -C user@hostname

Example:

ssh -C [email protected]

Run in the background without executing commands:

ssh -f -N user@hostname

Example:

ssh -f -N [email protected]

Port Forwarding

Local port forwarding:

ssh -L local_port:remote_host:remote_port user@hostname

Example:

ssh -L 8080:localhost:80 [email protected]

Remote port forwarding:

ssh -R remote_port:local_host:local_port user@hostname

Example:

ssh -R 8080:localhost:80 [email protected]

Dynamic port forwarding:

ssh -D [bind_address:]port user@hostname

Example:

ssh -D 1080 [email protected]

Advanced Usage

Configuration File

The SSH client configuration file is located at ~/.ssh/config, where common configurations can be set.

Example:

Host example
    HostName example.com
    User john
    Port 2222
    IdentityFile ~/.ssh/id_rsa

Simply use:

ssh example

SSH Agent Forwarding

Enable agent forwarding:

ssh -A user@hostname

Example:

ssh -A [email protected]

X11 Forwarding

Enable X11 forwarding:

ssh -X user@hostname

Example:

ssh -X [email protected]

Linux 命令大全Complete Linux Commands

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