Restores or create a new tmux development environment (4 panes)

dev-tmux

#!/bin/bash
SESSIONS=$(tmux ls)
RESTORED=false
IFS=':' read -ra SES <<< "$SESSIONS"
if [ ${#SES} != 0 ]; then
  for i in "${SES[@]}"; do
    if [ "$i" = "dev" ]; then
      RESTORED=true
      tmux a -t "$i"
    fi
  done
fi
if [ "$RESTORED" = false ]; then
  tmux new-session -s 'dev' -d
  tmux split-window -h
  tmux split-window -v
  tmux select-pane -t 0
  tmux split-window -v
  tmux select-pane -t 0
  tmux new-window 'dev'
  tmux -2 attach-session -d
fi