:>
:What will happen, if somebody (possibly you, as mahordomo says), tries to
:make a backup of that file.

    That will depend on the backup program.  dump/restore can handle
    holes just fine.  tar can handle them in a 'fake' way, and you have
    to tell it.  Programs like 'cp' cannot handle holes.... they'll
    copy the zero's.

:I'd be afraid to create something which could easily blow up by having
:normal operations applied to it.
:
:Leif

    Yes, there's a high probability of that.  It's one of the reasons 
    why people typically use the feature, at least not for 'permanent'
    data sets.

                                        -Matt



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