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

This is my utility function to do it, only executing the command when there there is nothing running in the pane.

#!/bin/bash

_send_bash_command_to_session() {
    if [[ $# -eq 0 || "$1" = "--help" ]] ; then
        echo 'Usage: _send_bash_command_to_session $session_name what ever command you want: '
        return
    fi
    input_session="$1"
    input_command="${@:2}"
    for _pane in $(tmux list-panes -s -t ${input_session} -F '#{window_index}.#{pane_index}'); do
        # only apply the command in bash or zsh panes.
        _current_command=$(tmux display-message -p -t ${input_session}:${_pane} '#{pane_current_command}')
        if [ ${_current_command} = zsh ] || [ ${_current_command} = bash ] ; then
            tmux send-keys -t ${_pane} "${input_command}" Enter
        fi
    done
}

tmux_set_venv() {
    _current_session=$(tmux display-message -p '#{session_name}')
    _send_bash_command_to_session ${_current_session} workon $1
}

Example targeting a session called dev, enabling a python virtualenv in all panes that are in bash or zsh, avoiding executing the command in panes with vim or any other executable:

_send_bash_command_to_session dev workon myvirtualenv

or easier to remember: to do it in the current session:

tmux_set_venv myvirtualenv

Find my configuration file with this function.