Add FAQ: "How do I use tmux to keep programs running?"

content/en/linux/using-tmux.md

@@ -0,0 +1,37 @@
+---
+title: "How do I use tmux to keep programs running?"
+type: docs
+tags:
+- SSH
+- Ubuntu
+---
+
+You can use the program `tmux` to keep programs and commands running after you
+log out of a server or
+[Cloud instance](https://lambdalabs.com/service/gpu-cloud). This is useful,
+for example, when
+[copying a large amount of data directly between servers or Cloud instances using `rsync`](https://rsync-to-copy-and-synchroniz.lambda-docs.pages.dev/linux/rsync-to-copy-and-synchronize/).
+
+To use `tmux`, first install `tmux` on the server or Cloud instance by
+running:
+
+```bash
+sudo apt -y update && sudo apt -y install tmux
+```
+
+Then, run the command `tmux` to create a `tmux` session. In the `tmux`
+session, run commands like you normally would.
+
+When you're ready to log out of the server or Cloud instance, press **Ctrl** +
+**b**, then press **d**. You'll "detach" from the `tmux` session and can
+safely log out of the server or Cloud instance.
+
+To reattach to the `tmux` session, first log into the server or Cloud
+instance. Then, run `tmux attach`.
+
+{{% alert title="Tip" color="success" %}}
+`tmux` has many useful features, such as the ability to create multiple panes
+to run commands in. See the [`tmux` wiki](https://github.com/tmux/tmux/wiki)
+to learn more about the features and customization options available in
+`tmux`.
+{{% /alert %}}