You want to do something like: 
for (<*>) {
    if(/\.TMB/i) {
        $old=$_;
        s/\.TMB$/T\.JPG/;
        die "$_ already exists" if (-e $_);
        rename($old, $_) or die "Failed to rename\n";
    }
}

[download]
update: added a check for exising file, following lemming's suggestion

In reply to Re: renaming files by fundflow
in thread renaming files by Anonymous Monk

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