updating @cb and @ub

[VL]

Fairlight wrote:
> At Thu, Dec 21, 2006 at 06:08:25PM -0500 or thereabouts, 
> suspect Bob Stockler was observed uttering:
>   
>> VL wrote (on Thu, Dec 21, 2006 at 03:22:04PM -0600):
>>
>> | Any way of updating @cb or @ub.  Some old user ids are changing and I 
>> | would like to change @cd and @ub in filepro so there username is pulled 
>> | in. 
>>
>> Other than using an Alien filePro file using that filePro
>> file's "key" file as its "real" file. I can think of no
>> other way.
>>     
>
> What about something written to just go through the key/data segment(s) and
> rewrite those parts of the 20-byte headers?  Perl could breeze through that.
> You'd have to make sure nobody was using the files while they were being
> operated on, but it certaily seems viable to me.
>
> My only concern would be if any indexes were built on them.  I though
> building indexes based on system-maintained fields was a Bad Idea[tm]
> though.  Or is that only @rn?
>
> mark->
>   
What is the format of the key and data files?  How would I go about 
updating them with perl?  No indexes on @cb or @ub.

Thanks,  
    Greg
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