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$_ the default variable of Perl
ref - What kind of reference is this variable?
Constants and read-only variables in Perl
Variable number of parameters in Perl subroutines
Variable declaration in Perl
Scalar variables
How much memory do Perl variables use?
"my" variable masks earlier declaration in same scope
Scope of variables in Perl
Detect recursion using state variables
Package variables and Lexical variables in Perl
Variable "..." will not stay shared ...
Scope of Variables - video
Variable interpolation - User Input and Output - chomp - video
Static and state variables in Perl
Scalar values and variables - video
Variable names
Exercise: parse variable width fields - video
Solution: parse variable width fields - video
Useless use of private variable in void context