in reply to How to sort in perl on the basis of one field.

Split columns according header delimiter,

http://learn.perl.org/faq/perlfaq4.html#How-do-I-sort-an-array-by-anything-, http://perldoc.perl.org/perlfaq4.html#How-do-I-sort-an-array-by-%28anything%29%3f

Understanding the Schwartzian transform., Re: Sorting a HoH by values of the nested hashes, Path::Tiny

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