SSH Cheat Sheet

Secure Shell (SSH) is a widely-used protocol for securely connecting to remote servers. This cheat sheet provides essential SSH commands for managing remote connections, file transfers, and more.

Introduction:

SSH provides encrypted communication over a network, allowing users to connect to and manage remote servers securely. Key-based authentication and secure file transfer make SSH a fundamental tool for system administrators and developers.

Connecting to a Remote Server:

Command	Description
`ssh [username]@[hostname]`	Connect to a remote server with SSH.
`ssh -p [port] [username]@[hostname]`	Specify a custom SSH port for connection.
`ssh -i [private_key] [username]@[hostname]`	Connect using a specific private key file.
`ssh -X [username]@[hostname]`	Enable X11 forwarding for GUI applications.

File Transfer with SCP:

Command	Description
`scp [file] [username]@[hostname]:[destination]`	Copy a file to a remote server.
`scp -r [directory] [username]@[hostname]:[destination]`	Copy a directory and its contents recursively.

SSH Key Management:

Command	Description
`ssh-keygen`	Generate a new SSH key pair.
`ssh-copy-id [username]@[hostname]`	Copy the public key to the remote server.
`ssh-add [private_key]`	Add a private key to the SSH agent.
`ssh-keyscan [hostname] >> ~/.ssh/known_hosts`	Add a host key to the known_hosts file.

Tunneling and Port Forwarding:

Command	Description
`ssh -L [local_port]:[destination_host]:[destination_port] [username]@[hostname]`	Local port forwarding.
`ssh -R [remote_port]:[destination_host]:[destination_port] [username]@[hostname]`	Remote port forwarding.

Executing Commands Remotely:

Command	Description
`ssh [username]@[hostname] [command]`	Execute a command on the remote server.
`ssh -t [username]@[hostname] [command]`	Force pseudo-terminal allocation.
`ssh -T [username]@[hostname] [command]`	Disable pseudo-terminal allocation.

Miscellaneous:

Command	Description
`ssh -v [username]@[hostname]`	Verbose mode, display detailed debugging output.
`ssh -o [option=value] [username]@[hostname]`	Set SSH options using the -o flag.
`ssh -J [jump_host] [username]@[hostname]`	Use a jump host to reach the target host.
`ssh -D [local_port] [username]@[hostname]`	Dynamic port forwarding (SOCKS proxy).

Conclusion

SSH is a critical tool for secure remote server management. This cheat sheet offers a quick reference for commonly used SSH commands, covering connection, file transfer, key management, and advanced features like port forwarding. Whether you are a system administrator or a developer, mastering these commands will enhance your efficiency in working with remote servers.

Introduction:

Connecting to a Remote Server:

File Transfer with SCP:

SSH Key Management:

Tunneling and Port Forwarding:

Executing Commands Remotely:

Miscellaneous:

Conclusion

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