if you are defining "UPPER_LIMIT" for a single script then 
use constant UPPER_LIMIT => 10;

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as suggested by lidden will be fine.If you want to scale up and use the same constant in multiple scripts then you can define the constant (and all common VARS that you scripts) in a file and require that file in you scripts! To illustrate this type the following 
$UPPER_LIMIT=10;
1;

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in a file called "ENV.pl"(Please note the 1 thats returned in last line), then in you scripts use 
require "ENV.pl";

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This will import the contents of ENV.pl

The world is so big for any individual to conquer

In reply to Re: simple substitution by narainhere
in thread simple substitution by megaurav2002

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