in reply to Re^2: Reading specific lines in a file
in thread Reading specific lines in a file

as pointed by ambrus in the chat $. come in place because of flip flop operator 
If either operand of scalar ".." is a constant expression, that operan
+d is considered true if it is equal (== ) to the current input line n
+umber (the $. variable).

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In Section Seekers of Perl Wisdom