ssh + tmux — remote work without losing your session

## ssh basics
`ssh user@host` — connect
`ssh -i ~/.ssh/key user@host` — with specific key
`ssh-keygen -t ed25519` — generate new key
`ssh-copy-id user@host` — push key to server
`scp file user@host:/path` — copy file to remote
`rsync -av src/ user@host:dst/` — sync dirs

## ssh config (~/.ssh/config)
```
Host prod
  HostName 1.2.3.4
  User deploy
  IdentityFile ~/.ssh/deploy_key
```
Then: `ssh prod`

## tmux essentials (prefix is Ctrl-b)
`tmux` — start session
`tmux ls` — list sessions
`tmux attach -t name` — reattach
`Ctrl-b c` — new window
`Ctrl-b n` — next window
`Ctrl-b "` / `Ctrl-b %` — split horizontal / vertical
`Ctrl-b d` — detach (leaves session running)