gistfile1.sh

#
# __selector: "prompt", "returnvar", "current_selected", "selection_list"
#
# __selector "Select a volume", "selected_volume", "", `ls -la /Volumes/`
# cd $selected_volume
#
function __selector() {
  local selections selPrompt selCurrent selListCommand selSize choose
  
  selPrompt=$1
  selReturn=$2
  selCurrent=$3
  selList=$4
  
  prompt=$selPrompt
  
  let count=0

  for sel in $selList; do
    let count++
    selections[$count-1]=$sel
  done
  if [[ $count > 0 ]]; then
    choose=0
    selSize=${#selections[@]}

    while [ $choose -eq 0 ]; do
      let count=0
    
      for sel in $selList; do
        let count++
        echo "$count) $sel"
      done
  
      echo 

      read -p "${prompt}, followed by [ENTER]:" choose

      if [[ $choose != ${choose//[^0-9]/} ]] || [ ! $choose -le $selSize ]
      then
        echo
        echo "Please choose one of the listed numbers."
        echo
        let choose=0
      fi

    done

    let choose--
  
    export ${selReturn}=${selections[$choose]}
  else
    return 0
  fi  
}