expire.ctl.5

早期freebsd实现

.\" $Revision: 1.11 $
.TH EXPIRE.CTL 5
.SH NAME
expire.ctl \- control file for Usenet article expiration
.SH DESCRIPTION
The file
.\" =()<.I @<_PATH_EXPIRECTL>@>()=
.I /var/spool/news/data/expire.ctl
is the default control file for the
.IR expire (8)
program, which reads it at start-up.
Blank lines and lines beginning with a number sign (``#'') are ignored.
All other lines should be in one of two formats.
.PP
The first format specifies how long to keep a record of fully-expired
articles.
This is useful when a newsfeed intermittently offers older news that
is not kept around very long.
(The case of very old news is handled by the ``\-c'' flag of
.IR innd (8).)
There should only be one line in this format, which looks like this:
.RS
/remember/:days
.RE
Where
.I days
is a floating-point number that specifies the upper limit to remember
a Message-ID, even if the article has already expired.
(It does not affect article expirations.)
.PP
Most of the lines in the file will consist of five colon-separated fields,
as follows:
.RS
.nf
pattern:modflag:keep:default:purge
.fi
.RE
The
.I pattern
field is comma-separated set of single
.IR wildmat (3)-style
patterns that specify the newsgroups to which the rest of the line applies.
Since the file is interpreted in order, the most general patterns
should be specified first, and the most specific patterns should be
specified last.
.PP
The
.I modflag
field can be used to further limit newsgroups to which the line applies,
and should be chosen from the following set:
.RS
.nf
M	Only moderated groups
U	Only unmoderated groups
A	All groups
.fi
.RE
.PP
The next three fields are used to determine how long an article
should be kept.
Each field should be either a number of days (fractions like ``8.5'' are
allowed) or the word ``never.''
The most common use is to specify the default value for how long an
article should be kept.
The first and third fields \(em
.I keep
and
.I purge
\(em specify the boundaries within which an Expires
header will be honored.
They are ignored if an article has no Expires header.
The fields are specified in the file as ``lower-bound default upper-bound,''
and they are explained in this order.
Since most articles do not have explicit expiration dates, however,
the second field tends to be the most important one.
.PP
The
.I keep
field specifies how many days an article should be kept before it will
be removed.
No article in the newsgroup will be removed if it has been filed
for less then
.I keep
days, regardless of any expiration date.
If this field is the word ``never'' then an article cannot have been kept
for enough days so it will never be expired.
.PP
The
.I default
field specifies how long to keep an article if no Expires header
is present.
If this field is the word ``never'' then articles without explicit
expiration dates will never be expired.
.PP
The
.I purge
field specifies the upper bound on how long an article can be kept.
No article will be kept longer then the number of days specified by this
field.
All articles will be removed after then have been kept for
.I purge
days.
If
.I purge
is the word ``never'' then the article will never be deleted.
.PP
It is often useful to honor the expiration headers in articles, especially
those in moderated groups.
To do this, set
.I keep
to zero,
.I default
to whatever value you wish, and
.I purge
to never.
To ignore any Expires header, set all three fields to the same value.
.PP
There must be exactly one line with a
.I pattern
of ``*'' and a
.I modflags
of ``A'' \(em this matches all groups and is used to set the expiration
default.
It should be the first expiration line.
.PP
For example,
.RS
.nf
##  How long to keep expired history
/remember/:5
##  Most things stay for two weeks
*:A:14:14:14
##  Believe expiration dates in moderated groups, up to six weeks
*:M:1:30:42
##  Keep local stuff for a long time
foo.*:A:30:30:30
.fi
.RE
.SH HISTORY
Written by Rich $alz <[e-mail]> for InterNetNews.
.de R$
This is revision \\$3, dated \\$4.
..
.R$ $Id: expire.ctl.5,v 1.11 1993/01/29 16:42:42 rsalz Exp $
.SH "SEE ALSO"
expire(8),
wildmat(3).