/sys$common/syshlp/helplib.hlb
DEFRAGMENT, FILE, Qualifiers, /EXCLUDE

 *Conan The Librarian

       /EXCLUDE=(file-spec[,...])
       /NOEXCLUDE (default)

          The /EXCLUDE qualifier specifies files to be excluded
          from processing. The defragmentation process ignores
          files matching the listed file specifications. Any
          file indicated in the EXCLUDE list and in either
          the FREQUENT or DORMANT lists is excluded from
          processing.

                                      NOTE

             The defragmentation process always excludes
             system files, open files, files excluded in an
             options file (/OPTIONS qualifier), and files
             excluded using the /IGNORE qualifier.
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