#!/bin/bash

var1=unset
previous=$var1

while echo "ÀÌÀü º¯¼ö = $previous"
      echo
      previous=$var1
      [ "$var1" != end ] # ¹Ù·Î ÀüÀÇ "var1"ÀÌ ¹«¾ùÀ̾ú´ÂÁö °è¼Ó È®ÀÎ.
      # "while"¿¡´Â 4°¡Áö Á¶°ÇÀÌ ÀÖÁö¸¸ ¿ÀÁ÷ ¸¶Áö¸· Á¶°ÇÀÌ ·çÇÁ¸¦ Á¦¾îÇÕ´Ï´Ù.
      # *¸¶Áö¸·* Á¾·á »óÅ°¡ Áß¿äÇÏ´Ù´Â ¸»¾¸.
do
echo "º¯¼ö°ªÀ» ³ÖÀ¸¼¼¿ä #1 (³¡³»·Á¸é end) "
  read var1
  echo "º¯¼ö #1 = $var1"
done  

# ÀÌ ½ºÅ©¸³Æ®°¡ ¾î¶»°Ô µ¹¾Æ°¡´ÂÁö ¾Ë¾Æ³» º¸¼¼¿ä.
# ¾à°£ ¹Ì¹¦ÇÑ(tricky) ºÎºÐÀÌ ÀÖ½À´Ï´Ù.

exit 0