nnspew - subject database manager (nn)
builds a sorted database of all available subjects in the
article database for fast access via the nngrab
should be activated regularly to rebuild the subject database,
e.g. by cron
. For example:
2 6,9,12,15,18,21 * * * root /bin/nice /usr/lib/nn/nnspew
Cross posted articles are only represented in the database once, and identical
subjects in each group are merged into one to use a minimum of disk space.
This saves about 50% of the disk space otherwise required.
$db/subjects subject database
nn(1), nngrab(1), egrep(1)
will use the subject database generated by nnspew
independent of its age. Thus, if you stop running nnspew
, remember to
remove the subjects file as well.
should automatically append new articles to the subject database
to keep it up-to-date, and thus require less frequent rebuilding using
James A. Woods, NASA Ames Research Center