my just defines a lexical variable in the current block. push is hopefully easy to understand, pack can get a little complicated - in this case it's turning the first three octets of the IP address into a byte string; so e.g. pack "C3", split /\./, "80.114.108.33" returns the bytes/chars "Prl" (the last octet is ignored because the template is "C3" and not "C4").

In addition to the general documentation such as perlsyn and perldata (Syntax and Data Types), to understand that code perldsc (Data Structures) will probably be useful; an introduction to the references used to create those data structures is in perlreftut. And a regular expression tutorial is at perlretut.

See also Modern Perl 2014 (free online edition), Learning Perl, and some of the links on this site: Getting Started with Perl

In reply to Re^4: perl quicker than bash? by Anonymous Monk
in thread perl quicker than bash? by TiffanyButterfly

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