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Can you please ELI5 tmux?
(lemmy.ml)
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this post was submitted on 11 Jul 2023
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I guess the best analogy is a "virtual desktop" but for the terminal.
It's is a program which runs in a terminal and allows multiple other terminal programs to be run inside it.
Each program inside tmux gets its own "page" or "screen" and you can jump between them (next-screen, previous-screen etc).
So instead of having multiple terminal windows, you only have one and switch the screen/page inside it.
You can detech from the program and leave it running - so next time you log on to the server, you can re-attach to it and all your screens/sessions are still there.
Not super useful on your local machine - but when you have to connect to a remote server (or several) is really shines. Especially if you have to go through a jumphost. You can just connect to your jumphost, start tmux, then create a "screen" for each server you need to connect to - do your stuff and deattach. Next time, just re-attach and all your stuff is there.
Did that help?
Ok, now I guess I am seeing the value of it, specially with the "virtual desktop" analogy and the remote scenario, since I need to do some of it at work and having everything as I left it last time will be nice. Thank you!
plus, if you disconnect in the middle of a command execution it doesn't get killed (very important for system updates for example)
…. or if you get disconnected by, say, dodgy internet connection or such.
Mosh is really good for that as well. It's like the tmux of ssh
I use the "being able to detach and re-attach" capability to run my Minecraft server on my in-home server box.
Imagine you ssh into a server to do a database import, and from previous experience you know it will take about 3 hours. You start the restore, then get up to make dinner. You come back an hour later and realize you forgot to plug your laptop in.
Is the import command still running? Who knows.
With tmux you just charge your laptop, ssh in again, and reconnect to the virtual term that was running the command to check.
Yeesh, I never knew about that. Probably because I normally only worry about SIGHUP on *BSD.
What kind of arrogance does it take to just decide to change how signals work?
Ugh I remembering learning upstart and getting decent with it and then everyone went “nope, systemd”
Let’s just improve what we have and not change the whole goddamn thing again. That’s more annoying.
Also, some of the people on hackernews are so cringy. Like, dude we get it there is a bad default. Make your case and stop being a total jerkoff, because no one is going to listen to that guy and I bet that’s like 20% of the reason the other übernerds are digging their heels in about changing it.
Also fuck systemd 😅
I actually get a lot of use out of it locally. I usually have multiple sessions for different concerns and prefix + s lets me switch between them quickly using vi keybindings. I can even do prefix + w to switch to a specific window in a different session.
I don't use vscode much lately, but when I did it was also useful sometimes to have the same window in my terminal client on one desktop and in vscode's terminal on another when switching back and forth a lot to see a browser or database client or whatever. Just having the freedom to move the session around to different applications is nice.
You can also split windows to have multiple terminals side by side, or above below each other. Many use it locally as a tileing window manager when their main terminal or window manager does not support tiling.
Adding to this comment that tmux allows team members spread through the world to work on the same terminal together on different SSH sessions.
Both admins connect, then one spins up the tmux and the other can attach to it and both collaborate and see all inputs/outputs.