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   lvm    ( 8 )

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Диагностика (Diagnostic)

All tools return a status code of zero on success or non-zero on
       failure.  The non-zero codes distinguish only between the broad
       categories of unrecognised commands, problems processing the
       command line arguments and any other failures.  As LVM remains
       under active development, the code used in a specific case
       occasionally changes between releases.  Message text may also
       change.