However it is not visible to another package.

Be careful here. Lexical variables don't care about packages, lexicals and packages are completely orthogonal concepts. 

use strict;
my $x = 42;

{
    package OtherPackge;
    print $x, "\n";

}

[download]

Lexical variables are visible within the current block, and each file is implicitly enclosed in a block.

In reply to Re^2: Checking the command line arguments by moritz
in thread Checking the command line arguments by newbie01.perl

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