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the delimiting identifier
原文：
The most common syntax for here documents, originating in Unix shells,
is << followed by a delimiting identifier (often the word EOF or END),
followed, starting on the next line, by the text to be quoted,
and then closed by the same delimiting identifier on its own line.
源自於Unix shells的here documents的最普遍的語法，
是 << 接著一個標識符(通常是EOF或者是END)，
標識符的下一行開始接著要引用的文字，
然後再在單獨的一行用相同的標識符關閉，
這段話表達的Syntax:
<< identifier （<< is followed by an identifier.）
text to be quoted (The identifier is followed by the text
starting on the next line)
identifier (closed by the same identifier on its own line.)
Example:
<< EOF ( << 接著一個標識符)
One (標識符的下一行開始接著要引用的文字)
Two
Three
EOF （再在單獨的一行用相同的標識符關閉）
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※ 編輯: LongboardDC (111.242.31.44 臺灣), 09/12/2021 21:15:12
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