Your language isn't very clear. If I understand the question correctly, then I would try this:

perl -MCPAN::FirstTime -e 'CPAN::FirstTime::init();'
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And from a script:

#!/usr/bin/perl

use strict;
use warnings;
use CPAN;
use CPAN::FirstTime;

CPAN::FirstTime::init();
CPAN::Shell->install(
"Bundle::CPAN",
"Bundle::LWP");
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