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2 examples

    2.1	The directory where FML creates archives

    	$ARCHIVE_DIR = 'var/archive'; (default is 'var/archive')

    The search path for archive directories is @ARCHIVE_DIR.
    $ARCHIVE_DIR is set to $ARCHIVE_DIR[0].

    2.2	Archive Unit

    The unit of packing articles to one file is

    	$ARCHIVE_UNIT

    If not defined, FML uses

    	$DEFAULT_ARCHIVE_UNIT (default 100)

    2.3	get command and search path

    Consider "get 1", "mget 1" command.  The search path when FML
    interprets "get" and "mget" command follows:

    * Case: "get 1" and "mget 1"

    1	$SPOOL_DIR (=> $FP_SPOOL_DIR)

    2	@ARCHIVE_DIR

    	If e.g. var/archive/100.tar.gz is found, FML extracts the
    	article 1 from it and send back the article.

    * Case: "mget 1-10"  command

    The search path algorithm is the same. If plain article are not found
    in spool and 100.tar.gz is found, FML extracts 1-10 articles from it
    and send back them.

    * Case: "get 100.tar.gz" and "mget 100.tar.gz"  command

    send back var/archive/100.tar.gz itself ("uuencode"d in default).

    2.4	Re-create summary file when expire

    	$EXPIRE_SUMMARY = 1;

    to re-create summary. This process removes older articles entries in
    summary.

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