This is why I still use vim, so that I can multiplex similar repositories.

multiplex.sh

#!/usr/bin/env bash

tmux new-session -d -s multiplex
tmux select-window -t multiplex:0

INDEX=0
for i in alice bob charles denice ephrahim fantasea greg
do
    tmux split-window -h
    tmux select-pane -t $INDEX
    tmux send-keys "cd $HOME/workspace/github.com/jim80net/$i" Enter
    ((INDEX+=1))
done
tmux select-layout tiled

tmux set-window-option synchronize-panes

tmux send-keys "# WARNING: Synchronize-panes on. Type \`C-b M-I\` to turn off." Enter

tmux attach-session -t multiplex