Re: crontab same time execution order

From: Dave McCammon (davemac11_at_yahoo.com)
Date: 07/05/03

  • Next message: rcooley: "MPlayer bsdbt848 TV-in problem on 4.7" 
    Date: Fri, 4 Jul 2003 22:43:37 -0700 (PDT)
To: Chuck Swiger <cswiger@mac.com>

    --- Chuck Swiger <cswiger@mac.com> wrote:
    > Dave McCammon wrote:
    > > If two entries in the crontab are for the same
    > time,
    > > which entry gets ran first?
    >
    > It's not deterministic, or if it happens to be so
    > under FreeBSD, it's not on
    > other platforms and you should not rely on a
    > particular order.
    >
    > If you've got commands which depend on each other in
    > cron, do something like:
    >
    > command1 ; command2 ; command3
    >
    > ...or...
    >
    > command1 && command2 && command3
    >

    Thanks for the reply.
    Basically, what I am looking for is to get a command
    to run right before newsyslog rotates a log
    file(awstats and apache log file.
     
    After I sent the message, I started playing with
    /etc/crontab and noticed that the lower on the list
    the sooner the command would run (per /var/log/cron)
    in comparison with a command set to run at the same
    time.
    What I did was put an 'echo' command above the
    newsyslog entry, restarted cron,waited for top of
    hour, checked log, moved command below the newsyslog
    entry, restarted cron, waited for top of hour and
    checked log file.
    The command ran before cron when listed lower and then
    ran after when command was listed above the newsyslog
    entry. I also noticed that when the 'atrun' command
    runs at the top of the hour, it will run after the
    newsyslog entry and newsyslog is listed lower in the
    /etc/crontab file.

    Perhaps this predictable behavior is in FreeBSD only.
    (I don't have access to other platforms). Or perhaps
    my simple test was too simple. It just seemed to be
    too predictable to not at least try to get some feed
    back.

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