#!/bin/bash

if [ -z "$1" ]
then
  Filename=names.data          # ÆÄÀÏÀ̸§ÀÌ ÁöÁ¤µÇÁö ¾ÊÀ» °æ¿ìÀÇ ±âº»°ª.
else
  Filename=$1
fi  

line_count=`wc $Filename | awk '{ print $1 }'`  # ´ë»ó ÆÄÀÏÀÇ ÁÙ ¼ö.
# "for" ·çÇÁ¿¡¼­ Ç¥ÁØÀÔ·ÂÀ» ÀçÁöÇâ ÇÏ´Â°Ô ¾ÆÁÖ ºÎÀÚ¿¬½º·¯¿ö º¸ÀÌ°í
# ±¸ÇöÇϱ⠱î´Ù·Ó°ÚÁö¸¸, ¿©·¯ºÐÀÌ ÃæºÐÈ÷ ¶È¶ÈÇÏ´Ù¸é °¡´ÉÇÕ´Ï´Ù.
#
# Á» ´õ °£´ÜÇÏ°Ô ÇÏ·Á¸é       line_count=$(wc < "$Filename")


for name in `seq $line_count`  # "seq"°¡ ¿¬¼ÓµÈ ¼ýÀÚ¸¦ Ãâ·ÂÇÑ´Ù´Â °Å, ±â¾ï³ª½ÃÁÒ?
# while [ "$name" != Smith ]   --   "while" ·çÇÁº¸´Ù ´õ º¹ÀâÇÕ´Ï´Ù.   --
do
  read name                    # Ç¥ÁØÀÔ·ÂÀÌ ¾Æ´Ñ $Filename ¿¡¼­ ÀÐ¾î µéÀÔ´Ï´Ù.
  echo $name
  if [ "$name" = Smith ]       # ÀÌ·± ÀÛ¾÷À» Ãß°¡ÀûÀ¸·Î µ¡ºÙ¿©¾ß ÇÕ´Ï´Ù.
  then
    break
  fi  
done <"$Filename"              # Ç¥ÁØÀÔ·ÂÀÌ $Filename ¿¡¼­ ÀçÁöÇâ µÊ.
#    ^^^^^^^^^^^^

exit 0