If you have a Tmux window divided into panes, you can use the synchronize-panes window option to send each pane the same keyboard input simultaneously: You can do this by switching to the appropriate window, typing your Tmux prefix (commonly Ctrl-B or Ctrl-A) and then a colon to bring up a Tmux command line, and typing: :setw synchronize-panes You can optionally add on or off to specify which stat