Short of doing this, is it possible to move a running command in a pane to another tmux session?


Yes it's pretty easy, use the move-pane tmux command. For more info run

man tmux | less -I '+/mOVE-pane'

The tricky part is just knowing how tmux references sessions, windows and panes in the commands to manipulate panes etc.

Step one

Move into the pane you want to move to the other session

Step two

Get the name of the target session by running <prefix>s.

On my system that produces:

 (0) + 0: 8 windows (attached)  
 (1) + 1: 1 windows 
    This is the session name. It could be different 
    on your system and it could be a word (not just a number).

Step 3 - run command

<prefix>:move-pane -t <session_name>:<window number>
                      ^^^^^^^^^^^^^^ the name from above goes in here

So on my system I moved into the pane with the running process, ran

<prefix>:move-pane -t 1:1

and the pane with the process in it moved to window one on the session 1.

It gets inserted as a split, so usually you would want to run window on the other session as a throwaway window.

Note: it seems that the target window does need to exist, else the move-pane command will issue an error.

For more background on the format for specifying sessions, windows and panes within a tmux command, see the section COMMANDS in man tmux.

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  • 15
    There's a simpler procedure: mark the pane with <prefix>m, go to the destination window with <prefix>w and move the marked pane there with join-pane. – Dan Aloni Jan 31 '18 at 15:32

I can't comment, so I will place it here: for tmux 2.1-3build1~precise the command should be:

<prefix>:move-pane -t session_name:window_number

-- you need a "-t" before session name (not necessarily a number), and the window with a given number must exist.

All the rest is as described by the_velour_fog in his answer.

P.S. If you type only a session_name without window_number like so:

<prefix>:move-pane -t session_name:,

then your pane will be moved into current window of destination session (and this window will be split).

P.P.S. If you just want to move your window (and not just your pane), then there a good answer on how to Move window between tmux clients:

<prefix>:move-window [-d] [-s src-window] [-t dst-window]

(alias: movew)

where src-window and dst-window have the form session:window.pane.

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I have two sessions running, each in their own iTerm. All I needed to do to move the pane from one session to another was

select the pane

<leader>s <session>

where <session> is a number inside square brackets

tmux 2.7

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  • That doesn't actually move the pane from one session to another. That just changes the session you're viewing from the current terminal. It's equivalent to disconnecting and connecting to the other session. I want to actually be able to move panes between sessions with multiple other panes open. – HEGX64 Sep 9 '18 at 8:27

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