Just redirect the pager output to /dev/tty: 
sub pager { 
        my $temp = "temp.txt";
        my $pager = "less";
        my $tty = "/dev/tty"; 
        system("$pager $temp >$tty");
}

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In reply to Re: Some system command not working as required after File::Tee by salva
in thread Some system command not working as required after File::Tee by perlyogi

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