A lightweight tmux alternative? Tmux is already an incredibly lightweight C program in terms of binary size and resource usage.
I assumed they meant “lightweight” in the sense that tmux can take quite a bit of setup and practice to get comfortable in, when using for the very first time. I love tmux but it’s definitely not “n00b” friendly.
# run your command in it
# Ctrl+b D to detatch
later, to attach back to it
$ tmux a -t 0
That probably covers 50% of usage. The rest would be naming the sessions, splitting the window panes. Anything else?