Edit: /usr/lib/byobu/include/tmux-send-command-to-all-windows (881B)
#!/bin/sh
#
# tmux-send-command-to-all-windows
# Copyright (C) 2014 Dustin Kirkland
#
# Authors: Dustin Kirkland
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, version 3 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see .
for w in $(tmux list-windows | $BYOBU_SED -e "s/:.*//"); do
tmux send-keys -t :$w "$@"
tmux send-keys -t :$w Enter
done