Why is $ENV{COLUMNS} undefined inside the Perl program?

From: Adam (a24061_at_yahoo.munged)
Date: 06/28/04 

Date: Mon, 28 Jun 2004 11:24:04 GMT

The environment variable $COLUMNS works as expected in bash

/home/adam $ echo $COLUMNS
165
[resizes xterm window]
/home/adam $ echo $COLUMNS
132

but $ENV{COLUMNS} is undefined inside a Perl program run from this
shell. Why? And how do I get its value inside the program?

I also tried
use Env qw (COLUMNS) ;
but $COLUMNS did not get defined. 

-- 
Thanks,
Adam

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