#!/bin/bash
# str-test.sh: Testing null strings and unquoted strings,
# but not strings and sealing wax, not to mention cabbages and kings...
# (¿Å±äÀÌ: ??? :)

# if [ ... ]  ¸¦ ¾µ²²¿ä.


#  ¹®ÀÚ¿­ÀÌ ÃʱâÈ­ ¾È µÆ´Ù¸é Á¤ÇØÁø °ªÀ» °®Áö ¾Ê´Âµ¥
#+ ÀÌ·± »óŸ¦ "³Î"(null)À̶ó°í ºÎ¸¨´Ï´Ù(0 °ú´Â ´Ù¸¨´Ï´Ù).

if [ -n $string1 ]    # $string1 Àº ¼±¾ðµµ ÃʱâÈ­µµ ¾È µÆ½À´Ï´Ù.
then
  echo "\"string1\" Àº ³ÎÀÌ ¾Æ´Õ´Ï´Ù."
else  
  echo "String \"string1\" Àº ³ÎÀÔ´Ï´Ù."
fi  
# Ʋ·ÈÁÒ.
# ÃʱâÈ­°¡ ¾È µÆ´Âµ¥µµ ³ÎÀÌ ¾Æ´Ñ °ÍÀ¸·Î ³ª¿À³×¿ä.


echo


# ´Ù½Ã Çغ¸ÁÒ.

if [ -n "$string1" ]  # À̹ø¿£ $string1 À» Äõ¿ìÆ® ½ÃÄѼ­ Çغ¸ÁÒ.
then
  echo "\"string1\" Àº ³ÎÀÌ ¾Æ´Õ´Ï´Ù."
else  
  echo "\"string1\" Àº ³ÎÀÔ´Ï´Ù."
fi      # Å×½ºÆ®¹®¿¡¼­´Â ¹®ÀÚ¿­À» ²À Äõ¿ìÆ® ½ÃÅ°¼¼¿ä!


echo


if [ $string1 ]       # À̹ø¿£ ´Þ¶û $string1 ¸¸ µÎ°í Çغ¸ÁÒ.
then
  echo "\"string1\" Àº ³ÎÀÌ ¾Æ´Õ´Ï´Ù."
else  
  echo "\"string1\" Àº ³ÎÀÔ´Ï´Ù."
fi  
# ÀÌ°Ç Àß µÇ³×¿ä.
# ¹®ÀÚ¿­À» Äõ¿ìÆ® ½ÃÅ°´Â °Ô("$string1") ÁÁÀº ½À°üÀ̱ä ÇÏÁö¸¸
# [ ] Å×½ºÆ® ¿¬»êÀڴ ȥÀÚ ¾²ÀÌ¸é ¹®ÀÚ¿­ÀÌ ³ÎÀÎÁö ¾Æ´ÑÁö¸¦ Àß ¾Ë¾Æ³À´Ï´Ù.
#
# Stephane Chazelas °¡ ÁöÀûÇÑ °Íó·³,
#    if [ $string 1 ]   ´Â ÀÎÀÚ°¡ "]" Çϳª°í,
#    if [ "$string 1" ]  ´Â ÀÎÀÚ°¡ ºó "$string1"°ú "]", µÎ °³ÀÔ´Ï´Ù.



echo



string1=initialized

if [ $string1 ]       # , $string1 À» ´Ù½Ã È¥ÀÚ ½áº¸ÁÒ.
then
  echo "\"string1\" Àº ³ÎÀÌ ¾Æ´Õ´Ï´Ù."
else  
  echo "\"string1\" Àº ³ÎÀÔ´Ï´Ù."
fi  
# ¿ª½Ã °á°ú°¡ ¸Â°Ô Àß ³ª¿ÀÁÒ.
# ¸¶Âù°¡Áö·Î ÀÌÀ¯·Î Äõ¿ìÆ® ÇØÁÖ´Â °ÍÀÌ("$string1") ÁÁ½À´Ï´Ù. ¿Ö³ÄÇϸé...


string1="a = b"

if [ $string1 ]       # $string1 À» ¶Ç È¥ÀÚ ¾¹´Ï´Ù.
then
  echo "\"string1\" Àº ³ÎÀÌ ¾Æ´Õ´Ï´Ù."
else  
  echo "\"string1\" Àº ³ÎÀÔ´Ï´Ù."
fi  
# ÀÌÁ¦ "$string1"À» Äõ¿ìÆ® ÇØ ÁÖÁö ¾ÊÀ¸¸é Ʋ¸° °á°ú°¡ ³ª¿É´Ï´Ù!

exit 0
# Florian Wisser°¡ ³¯Ä«·Ó°Ô ÁöÀûÇØ ÁØ °Í¿¡µµ °¨»çÇÕ´Ï´Ù.