This video will show you how to quickly create shared tmux sessions, which allow several people to collaboratively use a single shell session (in this case, on a remote machine over SSH).
LINKS FOR MORE ADVANCED USAGE:
http://www.howtoforge.com/sharing-terminal-sessions-with-tmux-and-screen
http://blog.niklasottosson.com/?p=574
My step-by-step project-based Linux course for beginners: https://www.udemy.com/course/hands-on-linux-self-hosted-wordpress-for-linux-beginners/?referralCode=19C0A7DEE2FD53C9C09D
Free Linux Sysadmin Course Playlist: https://www.youtube.com/playlist?list=PLtK75qxsQaMLZSo7KL-PmiRarU7hrpnwK
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