source .zshrc in every pane of every window of every session on the tmux server

gistfile1.sh

update_all_shells () {
    for session in $(tmux list-sessions|cut -d ':' -f 1); do
        for window in $(tmux list-windows -t $session | cut -d ':' -f 1); do
            tmux set-window-option -t $session:$window synchronize-panes on
            tmux send-keys -t $session:$window 'source ~/.zshrc'
            tmux send-keys -t $session:$window 'ENTER'
            tmux set-window-option -t $session:$window synchronize-panes off
        done
    done
}