tmux is a terminal multiplexer and can be very useful in when connecting to remote servers with flaky connectivity. Programs keep running even after disconnect and can be re-attached to the existing session and continue working without starting over.

It allows to open multiple windows and panes in a single session and can be easily switched between them.

Getting started with tmux:

1. create a new tmux session

   tmux
   

   to create a named tmux session, useful to easily identify a session

   tmux new -s <session_name>
   

2. to re-attach to an already running session

   tmux attach-session -t <session_name>
   #or shorter
   tmux a -t <session_name>
   

3. to detach from current session and leave everything running, use ctrl+b, d

4. to list all running sessions

   tmux ls
   

5. to scroll through the terminal contents, use

   • ctrl+b, <PgUp> to scroll up
   • ctrl+b, <PgDown> to scroll down

6. to get help about the available commands and their purpose, use ctrl+b, ?.

References:

1. tmux wiki
2. Tmux Cheat Sheet & Quick Reference