#!/bin/bash
# »ê¼ú Å×½ºÆ®.

# (( ... )) ´Â »ê¼ú¹®À» Æò°¡ÇÏ°í Å×½ºÆ® ÇØ ÁÝ´Ï´Ù.
# Á¾·á »óÅ´ [ ... ] ¿Í ¹Ý´ëÀÔ´Ï´Ù!

(( 0 ))
echo "\"(( 0 ))\" ÀÇ Á¾·á »óÅ´ $?."   # 1

(( 1 ))
echo "\"(( 1 ))\" ÀÇ Á¾·á »óÅ´ $?."   # 0

(( 5 > 4 ))                             # Âü
echo $?                                 # 0

(( 5 > 9 ))                             # °ÅÁþ
echo $?                                 # 1

exit 0