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Question
What is OpenSSH and what are its main uses?
Answer
OpenSSH is the open-source implementation of SSH (Secure Shell): an encrypted channel for logging into and running commands on a remote machine.
It replaced the old cleartext tools (telnet, rsh, rlogin) that sent passwords and keystrokes in the open. Everything between client and server is encrypted, so an eavesdropper on the network sees only ciphertext. Default port is 22/TCP.
Main uses:
| Use Case | Description |
|---|---|
| Remote shell | Interactive command-line access to remote systems |
| Remote commands | Execute single commands without interactive shell |
| File transfer | Secure copy with scp or sftp |
| Port forwarding | Tunnel other protocols through SSH |
| X11 forwarding | Run graphical apps remotely |
Basic connection:
ssh username@hostname
ssh student@192.168.1.100
Key features:
- Encrypted communication (replaces telnet, rsh)
- Password or key-based authentication
- Default port: 22
Tip: SSH is essential for Linux administration - servers typically have no GUI, only SSH access.
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