tmux-attach-to-session-on-host.sh

#!/usr/bin/env bash
# Checks if a tmux session with name $host exists, on remote $host.
# if so connect to it otherwise create session and connect to it.

host=$1

ssh $USER@$host tmux has-session -t $host 2>/dev/null

if [ "$?" -eq 1 ] ; then
    ssh $USER@$host tmux new-session -d -s $host
fi

ssh -t $USER@$host tmux attach-session -t $host