How to send a command to all panes in tmux?

Question

I like to call :clear-history on panes with a huge scrollback. However, I want to script a way to send this command to all the panes in the various windows.

Answer 1

You can combine synchronize-panes and send-keys in a single shortcut to send commands to all the panes:

Predefined tmux command clear-history:

bind-key C set-option -w synchronize-panes on\; clear-history \; set-option -w synchronize-panes off

Prompt an arbitrary tmux command:

bind-key p command-prompt -p "Panes command: " "set-option -w synchronize-panes on; %% ; set-option -w -u synchronize-panes"

Prompt an arbitrary shell command:

bind-key p command-prompt -p "Panes command: " "set-option -w synchronize-panes on; send-keys %%\\n ; set-option -w -u synchronize-panes"