tmux is a terminal multiplexer: it enables a number of terminals to be created, accessed, and controlled from a single screen. tmux may be detached from a screen and continue running in the background, then later reattached.
Debian, Ubuntu # apt install tmux Fedora, CentOS # yum install tmux
MUST remember CTRL+b (aka tmux prefix)
tmux Cheat Sheet
tmux new -s <name> : Create a new tmux session with <name> tmux attach -t <name> tmux ls : List all tmux sessions tmux kill-session -t <name> : Kill session with <name> CTRL+b+d: Detach current tmux session (exit without closing session) CTRL+b+s: Swap session CTRL+b+": Split horizontally (up and down panes) CTRL+b+%: Split vertically (left and right panes) CTRL+b+SHIFT+$ : Change the current tmux session's name