#!/bin/bash

echo

# When is a variable "naked", i.e., lacking the '$' in front?
# When it is being assigned, rather than referenced.

# ÇÒ´çÇÒ ¶§
a=879
echo "\"a\" ÀÇ °ªÀº $a ÀÔ´Ï´Ù."

# 'let'À¸·Î ÇÒ´çÇÒ ¶§
let a=16+5
echo "\"a\" ÀÇ °ªÀº ÀÌÁ¦ $a ÀÔ´Ï´Ù."

echo

# 'for' ·çÇÁ¿¡¼­(½ÇÁ¦·Î´Â, ÀÏÁ¾ÀÇ ¼ÓÀÓ¼ö ÇÒ´ç)
echo -n "·çÇÁ¿¡¼­ \"a\" ÀÇ °ªÀº "
for a in 7 8 9 11
do
  echo -n "$a ÀÔ´Ï´Ù."
done

echo
echo

# 'read' ¹®¿¡¼­(¿ª½Ã ÀÏÁ¾ÀÇ ÇÒ´çÀÓ)
echo -n "\"a\" ¸¦ ³ÖÀ¸¼¼¿ä."
read a
echo "\"a\" ÀÇ °ªÀº ÀÌÁ¦ $a ÀÔ´Ï´Ù."

echo

exit 0