tmux

Use

tmux new -s work
tmux ls
tmux attach -t work

What It Does

tmux is a terminal multiplexer. It keeps terminal sessions alive after SSH disconnects and lets one SSH connection contain multiple windows or panes.

First Session

Create a named session:

tmux new -s workbench

Detach without killing the session:

Ctrl-b d

List sessions:

tmux ls

Attach again:

tmux attach -t workbench

Core Keys

Tmux uses a prefix key before most shortcuts. The default prefix is Ctrl-b.

Action	Keys
Detach	`Ctrl-b d`
New window	`Ctrl-b c`
Next window	`Ctrl-b n`
Previous window	`Ctrl-b p`
Select window by number	`Ctrl-b <window number>`
Split horizontally	`Ctrl-b "`
Split vertically	`Ctrl-b %`
Move between panes	`Ctrl-b` then arrow key
Next pane layout	`Ctrl-b Space`
Zoom active pane	`Ctrl-b z`

Recovery

tmux ls says no server: no tmux session exists, so create one.
Nested tmux warning: you are already inside tmux. Detach or open a new window.
Command still died: tmux preserves terminals, not broken commands.

Docs Pointers

Run man tmux.
Read tmux wiki.
Read terminal multiplexing, terminal, and SSH login.