Tmux session initiation script: creates a new tmux session or attaches to an existing one.

tmux-session-init.sh

#!/bin/sh
# tmux session initialisation script

# change the following config to your preferences
SESSION="work"
workspace1="$HOME/server/www"
workspace2="$HOME/codeyard"

tmux has-session -t $SESSION > /dev/null

if [[ $? -eq 0 ]]
then
  echo "Session exists\n"
  tmux attach-session -t $SESSION
  exit 0;
fi

echo "Creating new session $SESSION\n"
cd $workspace1
tmux new-session -d -s $SESSION -n www-dev
cd $workspace2
tmux new-window -t $SESSION:2 -n codeyard

tmux select-window -t $SESSION:1
tmux attach-session -t $SESSION