1. From perldoc perlvar -
$/ The input record separator, newline by default. This influences
Perl's idea of what a "line" is. Works like awk's RS variable,
including treating empty lines as a terminator if set to the
null string. (An empty line cannot contain any spaces or tabs.)
You may set it to a multi-character string to match a
multi-character terminator, or to "undef" to read through the
end of file. Setting it to "\n\n" means something slightly
different than setting to "", if the file contains consecutive
empty lines. Setting to "" will treat two or more consecutive
empty lines as a single empty line. Setting to "\n\n" will
blindly assume that the next input character belongs to the next
paragraph, even if it's a newline. (Mnemonic: / delimits line
boundaries when quoting poetry.)
2. chomp removes whatever is in $/
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