#!/bin/bash

read var1 <data-file
echo "var1 = $var1"
# "data-file"ÀÇ Ã¹¹ø° ÁÙ Àüü°¡ var1À¸·Î ¼¼ÆÃ

read var2 var3 <data-file
echo "var2 = $var2   var3 = $var3"
# "read"ÀÇ Á÷°üÀûÀÌÁö ¾ÊÀº Çൿ¿¡ ÁÖÀÇÇϼ¼¿ä.
# 1) ÀÔ·Â ÆÄÀÏÀÇ Á¦ÀÏ Ã³À½À¸·Î µ¹¾Æ°¡¼­,
# 2) °¢ º¯¼ö´Â ÁÙ Àüü°¡ ¾Æ´Ñ °ø¹é¹®ÀÚ·Î ³ª´©¾îÁø ¹®ÀÚ¿­·Î ¼¼Æ®µÊ.
# 3) ¸¶Áö¸· º¯¼ö´Â ±× ÁÙÀÇ ³ª¸ÓÁö·Î ¼¼Æ®.
# 4) º¯¼ö °¹¼ö°¡ °ø¹é¹®ÀÚ·Î ³ª´©¾îÁø ¹®ÀÚ¿­º¸´Ù ¸¹´Ù¸é ³ª¸ÓÁö º¯¼öµéÀº ¼¼Æ®µÇÁö ¾ÊÀ½.

echo "------------------------------------------------"

# À§ÀÇ ¹®Á¦¸¦ ·çÇÁ·Î ÇØ°áÇØ º¸°Ú½À´Ï´Ù.
while read line
do
  echo "$line"
done <data-file
# Heiner Steven ÀÌ ÀÌ ºÎºÐÀ» ÁöÀûÇØ ÁÖ¾ú½À´Ï´Ù.

echo "------------------------------------------------"

# "read"°¡ ÀÐ¾î µéÀÌ´Â ÁÙÀÌ °ø¹é¹®ÀÚ°¡ ¾Æ´Ñ ´Ù¸¥ ¹®ÀÚ·Î ±¸ºÐµÇµµ·Ï ÇÏ·Á¸é
# $IFS(³»ºÎ ÇÊµå ±¸ºÐÀÚ, Internal Field Separator)¸¦ ¾²¸é µË´Ï´Ù.

echo "¸ðµç »ç¿ëÀÚ ¸ñ·Ï:"
OIFS=$IFS; IFS=:       # /etc/passwd ´Â ÇÊµå ±¸ºÐÀÚ·Î ":"¸¦ ¾¹´Ï´Ù.
while read name passwd uid gid fullname ignore
do
  echo "$name ($fullname)"
done </etc/passwd   # I/O ÀçÁöÇâ.
IFS=$OIFS              # ¿ø·¡ $IFS ¸¦ º¹±¸½ÃÅ´.
# ÀÌ Äڵ嵵 Heiner Steven ÀÌ Á¦°øÇØ ÁÖ¾ú½À´Ï´Ù.

exit 0