$ ./1.mod.pl 
CPAN
Capture::Tiny
Config::Tiny
Email::Find
HTML::FromText
Log::Log4perl
Module::ScanDeps
Net::SFTP::Foreign
Path::Tiny
Perl
Perl::Tidy
Spiffy
Test::Base
Test::Deep
Test::FailWarnings
Test::Fatal
Test::MockRandom
Test::More::UTF8
Test::Pod
Test::Requires
Test::WarningsExtUtils::Installed
Test::YAML
Text::Diff
Text::Template
Unicode::UTF8
YAML
$ cat 1.mod.pl 
#!/usr/bin/perl -w
use ExtUtils::Installed;
my $inst    = ExtUtils::Installed->new();
my @modules = $inst->modules();
 foreach $module (@modules){
      print $module . "\n";
}
__END__ 
$