update-catalog [options] --add centralized_catalog ordinary_catalog

       update-catalog [options] --remove centralized_catalog ordinary_catalog

       update-catalog [options] --update-super

       update-catalog inserts, updates or removes entries in the SGML central-
       ized catalogs located in /etc/sgml.  To change the SGML  super  catalog
       located in /etc/sgml/catalog modify the directory contents of /etc/sgml
       to contain new files or symbolic  links  having  a  .cat  extension  or
       remove (or move) existing centralized catalogs and regenerate the super
       catalog using the --update-super option.  See section SUPER CATALOG for
       details on the generation process.

       --add  Adds  an entry for the ordinary_catalog in the centralized_cata-

              Removes the entry for the  ordinary_catalog  from  the  central-

              Regenerates  the  SGML  super  catalog  from the contents of the
              /etc/sgml directory.  See section SUPER CATALOG for  details  on
              the super catalog generation.

              Prevents the usual diagnostic output.

       --test Prevents the update of the catalog and writes the resulting SGML
              catalog to standard output.

              Displays the version information and exits.

       --help Display the usage information and exits.

       The super-catalog located in /etc/sgml/catalog cannot be directly modi-
       fied.   It  is  generated by the update-catalog --update-super command.
       The generation considers files in the /etc/sgml directory that  have  a
       .cat extension.  For instance files ending in .old or .disabled are not
       considered.  Before adding a catalog to the super catalog it is  parsed
       and verified in order to not corrupt the super catalog.  All referenced
       catalogs are verified to actually exist.  If the check fails, a message
       is  printed  and  the  complete catalog is ignored.  This check ensures
       that a catalog from a package, which is  removed  but  not  purged,  is
       removed from the super catalog.

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