Given an array of module names, you can use UNIVERSAL::require to check for their presence: 
require UNIVERSAL::require;

my @modules_to_check = qw(Net::IP Net::CIDR List::BinarySearch);
for my $module (@modules_to_check) {
 $module->require or warn "$module failed to load\n";
}

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In reply to Re^3: checking for all packages by aitap
in thread checking for all packages by Wiggins

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