Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

List /var/cron/tabs in FILES and add descriptions for the other entries.

PR: 145912
Submitted by: Julian H. Stacey <jhs@berklix.com>
Obtained from: OpenBSD
MFC after: 1 week

Sort sections.

Markup nits.

Eliminate hard sentence breaks.
General markup fixes (use the .Dq macro).

Mention the fact that our crontab is not fully POSIX.2 conform, because
it doesn't allow the dangerous variant of calling it without any
argument.

Use `The .Nm utility'

Describe the format of the allow and deny files. This is more-or-less
the patch Matthew submitted, but I broke the lines in a more FreeBSD
way and made one small wording change.

PR: 31265
Submitted by: Matthew D. Fuller <fullermd@over-yonder.net>
MFC after: 3 weeks

mdoc(7) police: use the new features of the Nm macro.

Attempt to fix problem with users being able to convince the crontab
program to read any file which is a valid crontab file.

The fix is based on that used in NetBSD and OpenBSD - we keep the
file open while the user is editing it. This means that files must
be edited in place. Cron attempts to warn you if your editor does
not do this. The fact that the file must be edited in place is also
noted in the man page.

This patch has been confirmed to work by atleast one person on
-security and has been tested locally.

Obtained from: OpenBSD

$Id$ -> $FreeBSD$

Bad reference of su(8) changed to su(1).

.Sh AUTHOR -> .Sh AUTHORS. Use .An/.Aq.

Use err(3). Rewrote man page in mdoc format.

Revert $FreeBSD$ to $Id$

Make the long-awaited change from $Id$ to $FreeBSD$

This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.

This commit was generated by cvs2svn to compensate for changes in r2311,
which included commits to RCS files with non-trunk default branches.

Paul Vixie's cron, version 3.0. Munged into bmake format. If this goes
well, expect our two seperate directories for cron and crontab to go away
shortly.
Submitted by: jkh