#!/bin/bash

haystack=`mv random1231 random112211  2>&1`
needle="No such file or "


case $needle in
  # match start of string
  $haystack*) echo yep, it matches at the start ;;

  # match end of string
  *"$haystack") echo yep, it matches at the end ;;

  # searchString can be anywhere in thisString
  *"$haystack"*) echo yep, it matches in the middle somewhere ;;

  *) echo Not found ;;
esac