Bash – How to get the output inside `screen` out to a script

To keep screen busy after the script completes, just keep something persistent running in a window. The simplest choice for that "something" is probably an interactive shell. Here's one way to do it (assuming bash as the choice of interactive shell):

screen -dmS session_name sh -c '/share/Sys/autorun/start_udp_listeners.sh; exec bash'

• -dm: starts screen in detached mode
• -S: sets session name for screen for easier retrieval later on
• sh -c '...': instead of simply running your script, which will terminate, use sh -c to run multiple commands
• exec bash: after the script terminates, the sh from above will switch over to an interactive shell (bash), which should never exit until something external terminates it. This will keep screen open as long as the bash instance is alive.

tmux and screen have different models so there is no exact equivalent.

In screen terms, a split lets you display multiple windows at the same time. next (C-a n) rotates windows through the active part of the split; this lets you rotate “hidden” windows through the active region of the split.

In tmux terms, a split divides a window into one or more panes. Each part of a split window is an individual pane, panes are never hidden (if a window is selected (visible) all its panes are, too), and a pane can only be used in a single split of one window (a pane can not be in multiple windows, and it can not be in multiple splits of the same window). There are commands to move panes around in (or between) windows, but not in an identical way to next in screen.

You could use a binding like the following to arrange a similar effect:

bind-key C-n swap-pane -s :+.top \; rotate-window -Ut :+

You will probably want to put this in your ~/.tmux.conf file, but you can just type/paste it after Prefix : to bind it in your current server instance.

To use the binding, pick your “main window”, split it, create a “pane container” window immediately after the “main window”, then use the binding to rotate any pane in the “main window” among the group in the “pane container” window.

Here is how you might create the setup:

• Pick a window to use as your “main window”. Start (e.g.) Vim in it.

• Split your “main window” into two panes.

  E.g. Prefix " (:split-window)

  You can use this pane as your testing window (or log viewer, or whatever).

• Create a new window (the “pane container”) immediately after your main window.

  E.g. Prefix c (:new-window)

  It is important that no other window gets between the indexes of the “main window” and the “pane container” window (+ in the window specifiers used in the bound commands means “the next higher numbered window”).

• Split this window into a number of panes. To rotate through three panes, split this window into two panes (the third pane is the one in the “main window”).

  Maybe you need a shell for git, and a shell for running a database interface. Put each in a separate pane in this “pane container” window.

• Switch back to your “main window”. Select the pane that you want to “rotate out”.

  You can use Prefix Up/Down/Left/Right to move among the panes.

• Invoke the binding to swap the current pane with the first pane in “pane container” window and (“behind the scenes”) rotate the panes inside the “pane container” window (so that the next time you run the binding, the first command swaps with the “next” pane in the sequence).

  Prefix Control-n (the binding use C-n, but you could change this to whatever you like).

• To scroll backwards through the panes, you can use the below:

bind-key C-p swap-pane -s :+.bottom \; rotate-window -Dt :+