Script to provide a simple interface to tmux, a la run_screen

run_tmux.sh

#!/bin/bash
# adapted from run_screen, from the Bash Cookbook, 1st ed. May 2007
#                                         Albing, Vossen and Newham
# adapted by dent earl, dent earl at gmail
##############################

# Sanity check
if [ "$TERM" == "screen" ]; then
  printf "%b" "According to '\$TERM' we're using screen right now. \nAborting.\n"
  exit 1
elif [ "$_USING_TMUX" == "YES" ]; then
  printf "%b" "According to '\$_USING_TMUX' we're using tmux right now. \nAborting.\n"
  exit 1
elif [ "$USING_SCREEN" == "YES" ]; then
  printf "%b" "According to '\$USING_SCREEN' we're using screen right now. \nAborting.\n"
  exit 1
elif [[ ! -z "$TMUX" ]]; then
  printf "%b" "According to '\$TMUX' we're using tmux right now. \nAborting.\n"
  exit 1
fi

# The "$_USING_TMUX" variable is for the rare cases when tmux does
# NOT set $TMUX=screen. This can happen when 'tmux' is not in
# TERMCAP or friends. If we don't have some way to tell when we're inside
# tmux, this wrapper goes into an ugly and confusing endless loop.

# Seed list with Exit and New options and see what screens are already
# running; The select list is white space delimited, and we only want
# actual screen sessions, so use awk to filter for those, then remove
# any tabs from 'screen -ls' output.

available_tmux="Exit New $(tmux ls | awk '{print $1}' | perl -ple 's/://')"

# Present a list of choices
P3S='Choose a tmux for this session: '
select selection in $available_tmux; do
  if [ "$selection" == "Exit" ]; then
    break
  elif [ "$selection" == "New" ]; then
    export _USING_TMUX=YES
    exec tmux new -s $USER.$(date '+%Y-%m-%d_%H%M%S%z')
    break
  elif [ "$selection" ]; then
    exec tmux a -t $selection
    break
  else
    printf "%b" "Invalid selection.\n"
  fi
done