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${variable:-word}
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${variable:?word}
variable ¤¬Ì¤ÄêµÁ¤« null ¤Ç¤¢¤ì¤Ð word ¤òɸ½à¥¨¥é¡¼½ÐÎϤËɽ¼¨¡£¥·¥§¥ë¥¹¥¯¥ê¥×¥È¤Î½èÍýÃæ¤Ê¤é¥¹¥¯¥ê¥×¥È¤ò½ªÎ»¤¹¤ë¡£
${variable:+word}
variable ¤¬Ì¤ÄêµÁ¤« null ¤Ç¤¢¤ì¤Ð¤Ê¤Ë¤âŸ³«¤µ¤ì¤Ê¤¤¡£¤½¤ì°Ê³°¤Ê¤é word ¤ËÃÖ´¹¤µ¤ì¤ë¡£
${variable:offset:length}
variable ¤Î offset ʸ»úÌܤ«¤é length ʸ»ú¤òŸ³«¤¹¤ë¡£ offset, length ¤Ï»»½ÑŸ³«¤¬Í­¸ú¡£ offset ¤ËÉé¤ÎÃͤò»ØÄꤹ¤ë¤È¡¢Ê¸»úÎó¤ÎºÇ¸å¤«¤é¤Îʸ»ú¿ô¤Ë¤Ê¤ë¡£
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${variable[@]:offset:length}, ${variable[*]:offset:length}
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${#variable}
variable ¤Îʸ»ú¿ô¡ÊÇÛÎó¤Î¾ì¹ç¤ÏÍ×ÁÇ¿ô¡Ë¤ËÃÖ´¹¤µ¤ì¤ë¡£
${variable#pattern}, ${variable##pattern}
variable ¤ÎÀèƬ¤¬ pattern ¤Ë°ìÃפ¹¤ë¤Ê¤é¡¢¤½¤ì¤òºï½ü¤·¤ÆŸ³«¡£°ìÃפ·¤Ê¤±¤ì¤Ð variable ¤ò¤½¤Î¤Þ¤ÞŸ³«¡£ # ¤ÏºÇû°ìÃס¢ ## ¤ÏºÇĹ°ìÃס£
${variable%pattern}, ${variable%%pattern}
variable ¤ÎÀèƬ¤¬ pattern ¤Ë°ìÃפ¹¤ë¤Ê¤é¡¢¤½¤ì¤òºï½ü¤·¤ÆŸ³«¡£°ìÃפ·¤Ê¤±¤ì¤Ð variable ¤ò¤½¤Î¤Þ¤ÞŸ³«¡£ % ¤ÏºÇû°ìÃס¢ %% ¤ÏºÇĹ°ìÃס£
${variable/pattern/string}, ${variable//pattern/string}
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  • for variable [in word1 word2...;] do cmd; done
  • while cmd1; do cmd2; done
  • until cmd1; do cmd2; done
  • if cmd1; then cmd2; [elif cmd3; then cmd4;] fi
  • case word in pattern1 [ | pattern2...] ) cmd ;; ... [ * ) cmd ;;] esac
  • select variable [in word1 word2...;] do cmd; done

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