ssh

<!-- TOC: Quick Start | THE EXACT PROMPT | Essential Commands | Config | AGENTS.md Blurb | References --> # SSH — Secure Remote Access > **Core Capability:** Secure shell connections, key management, tunneling, and file transfers. --- ## Quick Start ```bash # Connect to server ssh user@hostname # Connect with specific key ssh -i ~/.ssh/my_key user@hostname # Run remote command ssh user@host "cd /app && git status" # Copy file to remote scp local.txt user@host:/remote/path/ # Sync directory (preferred over scp) rsync -avzP ./local/ user@host:/remote/ ``` --- ## THE EXACT PROMPT — Common Workflows ### Connect Through Jump Host ```bash # Single jump (bastion) ssh -J jumphost user@internal-server # Multiple jumps ssh -J jump1,jump2 user@internal-server ``` ### Local Port Forward (access remote service locally) ```bash # Access remote:80 via localhost:8080 ssh -L 8080:localhost:80 user@host # Access db-server:5432 via localhost:5432 through jumphost ssh -L 5432:db-server:5432 user@jumphost ``` ### Generate and Deploy Key ```bash # Generate Ed25519 key (recommended) ssh-keygen -t ed25519 -C "you@example.com" # Copy public key to server ssh-copy-id user@host ``` --- ## Essential Commands | Task | Command | |------|---------| | Connect | `ssh user@host` | | Connect on port | `ssh -p 2222 user@host` | | Connect with key | `ssh -i ~/.ssh/key user@host` | | Run remote command | `ssh user@host "command"` | | Interactive remote | `ssh -t user@host "htop"` | | Copy t...