Example, how to script tmux to recreate a session with predefined windows and panes

tmux_article.sh

#!/bin/bash

PROJECT_NAME="article"

# Check if a session with a such name already exists
tmux has-session -t $PROJECT_NAME

# If session does not exists
if [ $? != 0 ]
then
  # Create a new session with a specified name and with a windows with name `window1`
  tmux new-session -s $PROJECT_NAME -n window1 -d
  # Run rvm command in the window1
  tmux send-keys -t $PROJECT_NAME "rvm use 2.3.4" C-m
  # Split window1 horizontally
  tmux split-window -h -t $PROJECT_NAME
  # Run cd command in the just created new pane of the window1
  tmux send-keys -t $PROJECT_NAME "cd ~/Downloads" C-m
  # Split window vertically
  tmux split-window -v -t $PROJECT_NAME
  # Create new window with a name window2
  tmux new-window -n window2 -t $PROJECT_NAME
  # Select a first window as an active one
  tmux select-window -t $PROJECT_NAME:1
fi

# Attach to the session with a specified name
tmux attach -t $PROJECT_NAME