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$_ the default variable of Perl
Regex capturing variables $1, $2, $3, $4, $5, $6, ...
Variable "..." will not stay shared ...
ref - What kind of reference is this variable?
Variable declaration in 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 number of parameters in Perl subroutines
How much memory do Perl variables use?
Static and state variables in Perl
Detect recursion using state variables
$a - $b - Special variables when using sort(). Don't use them for anything else besides your sort function!
Exercise: parse variable width fields - video
Solution: parse variable width fields - video
Constants and read-only variables in Perl
Useless use of private variable in void context