原文链接:https://www.geeksforgeeks.org/perl-multi-line-strings-here-document/
Multi–line string using Here Document
Here Document is an alternative way for multiple print statements. A Here-Document can also be used for multi–line string. It declares a delimiter at the start to know till where the string needs to take input. A Here-Document starts with ‘<<’ followed by the delimiter of the user’s choice. The string reads the code until the delimiter occurs again and all the text in between is taken as the string.
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