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