#!/bin/bash
# 'exec'·Î Ç¥ÁØÀÔ·Â ÀçÁöÇâ Çϱâ.


exec 6<&0          # Ç¥ÁØÀÔ·ÂÀ» 6¹ø ÆÄÀÏ µð½ºÅ©¸³ÅÍ·Î ¸µÅ©.

exec < data-file   # Ç¥ÁØÀÔ·ÂÀ» "data-file"¿¡¼­.

read a1            # "data-file"ÀÇ Ã¹¹ø° ÁÙÀ» ÀÐÀ½.
read a2            # "data-file"ÀÇ µÎ¹ø° ÁÙÀ» ÀÐÀ½.

echo
echo "´ÙÀ½Àº ÆÄÀÏ¿¡¼­ ÀÐ¾î µéÀÎ °ÍÀÔ´Ï´Ù."
echo "-----------------------------------"
echo $a1
echo $a2

echo; echo; echo

exec 0<&6 6<&-
# 6¹ø ÆÄÀÏ µð½ºÅ©¸³ÅÍ¿¡ ÀúÀåµÇ¾î ÀÖ´ø Ç¥ÁØÀÔ·ÂÀ» º¹±¸½ÃÅ°°í,
# ´Ù¸¥ ÇÁ·Î¼¼½º°¡ ¾µ ¼ö ÀÖµµ·Ï 6¹ø ÆÄÀÏ µð½ºÅ©¸³Å͸¦ ÇÁ¸®( 6<&- )½ÃÅ´.
# <&6 6<&-    ¶ó°í Çصµ µË´Ï´Ù.

echo -n "µ¥ÀÌŸ¸¦ ³ÖÀ¸¼¼¿ä  "
read b1  # "read"´Â ÀÌÁ¦ ¿ø·¡ ÀÚ½ÅÀÇ µ¿ÀÛÀΠǥÁØÀԷ¿¡¼­ ÀÔ·ÂÀ» ¹Þ½À´Ï´Ù.
echo "Ç¥ÁØÀԷ¿¡¼­ ÀÐÀº °ª."
echo "---------------------"
echo "b1 = $b1"

echo

exit 0