Related

Secure Copy Files Between Hosts

linux

Securely copy files or directories between local and remote hosts over SSH.

Test Network Connectivity

linux

Test the reachability of a network host and measure round-trip time for packets sent to it.

Configure Network Interfaces

linux

Display or configure network interface parameters.

linux/ssh

Secure Shell Remote Login

Securely connect to remote systems using encrypted communication.

network
remote
security
encryption
linux

Command

ssh

Explanation

The `ssh` (Secure Shell) command establishes encrypted network connections to remote systems. It authenticates users with passwords or cryptographic keys and allows command execution or full terminal sessions. It also supports tunneling, forwarding, and agent-based authentication.

Common Use Cases

  • •Remote server administration
  • •Running commands on remote machines
  • •Secure file transfers using `scp` or `sftp`

Best Practices

  • ✓Use SSH key-based authentication instead of passwords
  • ✓Disable root login in `/etc/ssh/sshd_config`
  • ✓Regularly rotate SSH keys for security

Common Mistakes to Avoid

  • ⚠Incorrect file permissions on private keys
  • ⚠Forgetting to specify custom SSH ports

Troubleshooting

Problem: Permission denied (publickey)

Solution: Ensure the correct private key is used and permissions are set to 600.

Problem: Connection refused

Solution: Verify SSH service is running and firewall rules allow connections.

Examples

Connect to remote host as specified user

ssh user@host

Connect on a custom SSH port

ssh -p 2222 user@host

Authenticate with specific private key

ssh -i ~/.ssh/id_rsa user@host

More

Display Network Statistics

linux

Show network connections, routing tables, interface statistics, and listening ports.

OpenSSL

linux

SSL/TLS toolkit

List Directory Contents

linux

List files and directories in the current or specified directory with various formatting options.