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As in many interpreters, PERL allows you to generate a line from the interpreter using an eval function (JavaScript is similar)
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Suppose you had two arrays $fred[$index] and $jim[$index] and you wanted to load them given value of $index and an ascii string $name (which could have been read in) taking value 'fred' or 'jim'. This can be achieved by:
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eval('$' . $name . '[' . $index . ']') = $value;
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eval returns result of evaluating(executing) argument as PERL script and continues
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In this case, you can achieve the same results with indexed associative arrays:
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$options[$index]{$name} = $value;
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using the nultidimensional array notation introduced in PERL5
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