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if expression then statement
'statement'´Â 'expression'¿¡ ÇØ´çÇÏ´Â Á¶°ÇÀÌ ÃæÁ·µÇ¾úÀ» ¶§¸¸ ½ÇÇàµÈ´Ù. C¾ð¾î Ã¥ »ç¼ ù À常 º¸°í ¼Õ ¾È´í ºÐÀ̶ó ÇÒÁö¶óµµ ±¸°æÇØ º¸¼ÌÀ» ¸¸ÇÑ Çü½ÄÀÌ´Ù.
Á¶°Ç¹®ÀÇ Çü½Ä Áß¿¡´Â ´ÙÀ½°ú °°Àº °Íµµ ÀÖ´Ù.
if expression then statement1 else statement2.
ÀÌ°Í ¿ª½Ã ¸¹ÀÌµé º¸½Å ÇüÅÂÀ̰ÚÁö¸¸, 'expression'¿¡ ÇØ´çÇÏ´Â Á¶°ÇÀÌ ÃæÁ·µÇ¸é 'statement1'ÀÌ ½ÇÇàµÇ°í, ±×·¸Áö ¾ÊÀ¸¸é 'statement2'°¡ ½ÇÇàµÇ´Â ¹æ½ÄÀÌ´Ù.
¾Õ¼ ¸»ÇÑ °Í º¸´Ù Á¶±Ý ´õ ÁøÈµÈ ÇüŸ¦ »ìÆìº¸ÀÚ¸é ´ÙÀ½°ú °°´Ù. if expression1 then statement1 else if expression2 then statement2 else statement3. ÀÌ ¹æ½Ä¿¡¼µµ 'expression1'À» ÃæÁ·Çϸé 'statement1'ÀÌ ½ÇÇàµÈ´Ù´Â Á¡¿¡¼´Â ¾Õ¼ »ìÆìº» ¿¹¿Í °°´Ù. ±×·¯³ª 'expression1'ÀÌ ÃæÁ·µÇÁö ¾ÊÀ» °æ¿ì¿¡´Â 'expression2'¶ó´Â »õ·Î¿î Á¶°ÇÀÌ ³ªÅ¸³´Ù. ¸¸ÀÏ ÀÌ·¸°Ô 'expression2'¿Í ºñ±³ÇÏ¿© Á¶°ÇÀ» ÃæÁ·Çϸé statement2'°¡ ½ÇÇàµÇÁö¸¸ ±×·¸Áö ¾ÊÀ» °æ¿ì¿¡´Â 'statement3'ÀÌ ½ÇÇàµÈ´Ù. ÀÌ °úÁ¤Àº 'else if'¶ó´Â ³à¼®À» ÀÌ¿ëÇϴµ¥, 'else if'¸¦ ¾ó¸¶µçÁö Ãß°¡ÇÏ¿© ´Ù¾çÇÑ ºÐ±â¸¦ ¸¸µé ¼ö ÀÖ´Ù.
°£´ÜÇÑ ¹®¹ý Çü½ÄÀ» º¸µµ·Ï ÇÏÀÚ.
bash¿¡¼ if¸¦ »ç¿ëÇÒ ¶§¿¡´Â ´ÙÀ½°ú °°Àº Çü½ÄÀ¸·Î ÀÛ¼ºÇÑ´Ù.
if [expression];
then
('expression'ÀÌ ÂüÀ϶§ ½ÇÇàÇÒ ÄÚµå )
fi
#!/bin/bash if [ "foo" = "foo" ]; then echo expression evaluated as true fi |
ÀÌ ÄÚµå´Â if µÚ¿¡ ³ª¿Â Á¶°ÇÀÌ ÂüÀ϶§ 'expression evaluated as true' ¶ó´Â ¹®ÀåÀ» Ãâ·ÂÇÏ´Â ³»¿ëÀÌ´Ù. º¸¸é ¾Ë°ÚÁö¸¸ Á¶°Ç µÚ¿¡´Â 'then'À̶ó°í ÀûÇôÀÖ°í, Á¶°ÇÀÌ ÂüÀ϶§ ½ÇÇàÇÒ ³»¿ëÀ» ÀûÀº µÚ¿¡´Â 'fi'¶ó°í Àû¾î Á¶°Ç¹®ÀÌ ³¡³µÀ½À» ¾Ë·ÁÁØ´Ù.
#!/bin/bash if [ "foo" = "foo" ]; then echo expression evaluated as true else echo expression evaluated as false fi |
#!/bin/bash T1="foo" T2="bar" if [ "$T1" = "$T2" ]; then echo expression evaluated as true else echo expression evaluated as false fi |