Install and run
sudo apt install tmux
To send a command press Ctrl+b then the command character. Use ? for help.
Ctrl+b ? show help
Panels
Ctrl+b % vertical split
Ctrl+b “ horizontal split
Ctrl-b <arrow key> change panel
Ctrl-b Ctrl-<arrow key> resize the panel in the specified direction
Ctrl-d or exit close a panel
Windows
Ctrl-b c create a window
Ctrl-b n next window
Ctrl-b p previous window
Detach and reattach
Ctrl-b d detach the current session
Reattach
# List existing sessions
tmux ls
# Attach to session 0
tmux attach -t 0
Session names
# create a new named session
tmux new -s database
# rename an existing session
tmux rename-session -t 0 database
# connect to named session
tmux attach -t database
Other nice commands
Ctrl-b z make a panel go full screen and back to normal size
Ctrl-b , rename the current window