Using $$ to get the value of the reference

   

$variable1 = 5;

$variablename = "variable1";

print "$$variablename\n";

print "$variablename\n";

1.	Perl 5 Dereferencing Operators
2.	Perl 5 Reference Assignments
3.	Reference is a scalar variable
4.	Increments Reference
5.	Nested reference
6.	References to references
7.	References, Pointers
8.	Creating and Dereferencing Pointers
9.	Creating and dereferencing a reference
10.	Creating reference for arrays
11.	Demonstrates the reference syntax
12.	Dereference pointer
13.	Dereferencing a Reference
14.	Dereferencing the Pointer
15.	Direct Reference Techniques
16.	Direct Scalar References
17.	Exchange reference
18.	Get a reference to a file handle by using '$ioreference = *name{IO};'
19.	Get reference of a range
20.	Get the reference of the return value from substr
21.	Get the reference to a scalar by using the form '$scalarreference = *name{SCALAR};'
22.	Get the reference to a subroutine by using the form '$codereference = *name{CODE};'
23.	Get the value from a reference
24.	A reference is a scalar variable pointing-or refering to-something else
25.	Reference Modification

Using $$ to get the value of the reference : Reference « Data Type « Perl