/usr/lib/byobu/include/tmux-send-command-to-all-windows is in byobu 5.77-0ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | #!/bin/sh
#
# tmux-send-command-to-all-windows
# Copyright (C) 2014 Dustin Kirkland
#
# Authors: Dustin Kirkland <kirkland@byobu.co>
#
# 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 <http://www.gnu.org/licenses/>.
for w in $(tmux list-windows | $BYOBU_SED -e "s/:.*//"); do
tmux send-keys -t :$w "$@"
tmux send-keys -t :$w Enter
done
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