syntax of do while loop in shell script code example

Example 1: while loop bash

while true;
do
	#code
done

Example 2: shell script while loop example

#!/bin/sh
INPUT_STRING=hello
while [ "$INPUT_STRING" != "bye" ]
do
  echo "Please type something in (bye to quit)"
  read INPUT_STRING
  echo "You typed: $INPUT_STRING"
done