A simple clusterssh clone to ssh into many machines at once in a single tmux session. Use `set synchronize-panes` to send commands to all panes at once.

tssh.sh

#!/bin/sh
# tssh -- Andrew Fresh <andrew AT AFresh1.com>
set -e

if [ -z "$*" ]; then
    echo "usage: tssh server1 [[[server2] server3] ...]"
    exit 2
fi

new=""
next="new-session -d"
for s in "$@"; do
    new="$new $next ssh $s ; select-layout tiled ;"
    next="split-window"
done

export TMUX_TMPDIR=`mktemp -td tssh-XXXXXXXXX`
[ -z "$TMUX_TMPDIR" ] && exit 1
trap 'rm -rf "$TMUX_TMPDIR"' 0 1 2 15

tmux $new set-option exit-unattached on \; attach-session