Snippet to trap a keystroke. Press any key to continue...

ReadOneKey.sh

#!/bin/bash

readOne () {
  tput smso
  echo "Press any key to return \c"
  tput rmso
  oldstty=`stty -g`
  stty -icanon -echo min 1 time 0
  dd bs=1 count=1 >/dev/null 2>&1
  stty "$oldstty"
  echo
}