Let's also hope that he's not running an old version of perl, either. On old systems, glob() (and the diamond glob operator) called the external shell program csh, which overzealous sysadmins were prone to deleting when they "upgraded" to their favourite shell.
As I understand it, glob() still calls File::Glob; and a bug in the handling of tags is why I can't make debug mode work with the old perl5.6.1 scripts we have on our system. *sigh*. In other words, using glob() has always been a risky proposition.
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Ytrew