Linux/Bash

SSH Commands

Connect securely to remote systems. Learn SSH configuration, key authentication, and tunneling for secure remote access.

9 commands

Pro Tips

Use SSH config (~/.ssh/config) to save host aliases, usernames, and key paths for quick access.

Use 'ssh-copy-id user@host' to easily install your public key for passwordless login.

Use '-J' for jump hosts: 'ssh -J jump-host target-host' chains through a bastion server.

Common Mistakes

Never share private keys. If compromised, regenerate keys and update all authorized_keys.

Commands

SSH tunnel (local port forward)

$ ssh -L 8080:localhost:80 user@remote

Forward local port 8080 to remote's localhost:80.

SSH with key file

$ ssh -i ~/.ssh/key.pem user@host

Connect using a specific private key.

Copy SSH key to server

$ ssh-copy-id user@host

Install your public key on a remote server.

Generate SSH key pair

$ ssh-keygen -t ed25519 -C 'your@email.com'

Generate a modern Ed25519 SSH key pair.

Remote port forward

$ ssh -R 9090:localhost:3000 user@remote

Expose local port 3000 on the remote server as port 9090.

SOCKS proxy via SSH

$ ssh -D 1080 user@remote

Create a SOCKS5 proxy tunnel through the remote server.

Copy file via SCP

$ scp -r /local/dir user@remote:/remote/dir

Securely copy a directory to a remote server.

Run remote command

$ ssh user@host 'df -h && free -m'

Execute commands on a remote server without interactive session.

SSH with agent forwarding

$ ssh -A user@bastion

Forward local SSH agent to the remote host for key-based access to other servers.

Linux/Bash

SSH Commands

Connect securely to remote systems. Learn SSH configuration, key authentication, and tunneling for secure remote access.

9 commands

Pro Tips

Use SSH config (~/.ssh/config) to save host aliases, usernames, and key paths for quick access.

Use 'ssh-copy-id user@host' to easily install your public key for passwordless login.

Use '-J' for jump hosts: 'ssh -J jump-host target-host' chains through a bastion server.

Common Mistakes

Never share private keys. If compromised, regenerate keys and update all authorized_keys.

Commands

SSH tunnel (local port forward)

$ ssh -L 8080:localhost:80 user@remote

Forward local port 8080 to remote's localhost:80.

SSH with key file

$ ssh -i ~/.ssh/key.pem user@host

Connect using a specific private key.

Copy SSH key to server

$ ssh-copy-id user@host

Install your public key on a remote server.

Generate SSH key pair

$ ssh-keygen -t ed25519 -C 'your@email.com'

Generate a modern Ed25519 SSH key pair.

Remote port forward

$ ssh -R 9090:localhost:3000 user@remote

Expose local port 3000 on the remote server as port 9090.

SOCKS proxy via SSH

$ ssh -D 1080 user@remote

Create a SOCKS5 proxy tunnel through the remote server.

Copy file via SCP

$ scp -r /local/dir user@remote:/remote/dir

Securely copy a directory to a remote server.

Run remote command

$ ssh user@host 'df -h && free -m'

Execute commands on a remote server without interactive session.

SSH with agent forwarding

$ ssh -A user@bastion

Forward local SSH agent to the remote host for key-based access to other servers.