It will only complain about multiple files if there are multiple files, in which case you don't want to collapse them into a single file before processing, so perhaps this is what you want:
for my $original ( glob '/path/lbn9*.cnt' ) {
    rename $original, '/path/lbn9.cnt';
    # file processing here...
}

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In reply to Re: renaming files question by DungeonKeeper
in thread renaming files question by Angharad

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