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Learning Perl, Second Edition by Randal L. Schwartz, Tom Christiansen

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D.7. Symbol Table Manipulation with *FRED

You can make b an alias for a with *b = *a. This means that $a and $b refer to the same variable, as do @a and @b, and even filehandles and formats a and b. You can also localize *b inside a block with local(*b), and that lets you have local filehandles and formats and other things. Pretty fancy stuff, but useful when you need it.

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