[Cialug] Cron

[Josh More]

Yeah.  If you want things to happen in order, do them on one line with
semicolons.  Cron basically threads, so you can't rely on timing for when a
specific thread will start or stop.

Though that does make me wonder if the creation, modification, and access
times on the file system are from the beginning or the end of the read or
write operation.

-Josh

On Wed, Mar 23, 2016 at 5:09 PM, David Champion <dchamp1337 at gmail.com>
wrote:

> Also illustrates that you can't count on the order things will execute in
> this manner, since second.txt and third.txt are out of order. But, close
> enough.
>
> -dc
>
> On Wed, Mar 23, 2016 at 4:46 PM, kristau <kristau at gmail.com> wrote:
>
> > Interesting results:
> >
> > 40 16 * * *     echo "FIRST" > /tmp/first.txt
> > 40 16 * * *     echo "SECOND" > /tmp/second.txt
> > 40 16 * * *     echo "THIRD" > /tmp/third.txt
> > 40 16 * * *     echo "FOURTH" > /tmp/fourth.txt
> > 40 16 * * *     echo "FIFTH" > /tmp/fifth.txt
> >
> > ls -lt --full-time /tmp/*.txt
> > -rw-r--r--. 1 kristau kristau 6 2016-03-23 16:40:06.350406655 -0500
> > /tmp/first.txt
> > -rw-r--r--. 1 kristau kristau 6 2016-03-23 16:40:06.340406654 -0500
> > /tmp/third.txt
> > -rw-r--r--. 1 kristau kristau 7 2016-03-23 16:40:06.335406654 -0500
> > /tmp/second.txt
> > -rw-r--r--. 1 kristau kristau 7 2016-03-23 16:40:06.327406653 -0500
> > /tmp/fourth.txt
> > -rw-r--r--. 1 kristau kristau 6 2016-03-23 16:40:06.304406652 -0500
> > /tmp/fifth.txt
> >
> >
> > I'd say, "Simultaneous enough?"
> >
> > On Tue, Mar 22, 2016 at 7:53 PM, Josh More <jmore at starmind.org> wrote:
> > > They're basically simultaneous:
> > >
> > > 50 19 * * * sleep 120; echo "Test" > /tmp/1
> > > 50 19 * * * echo "Test" > /tmp/2
> > >
> > >
> > > $ ls -alrt /tmp/?
> > > -rw-r--r-- 1 root root 5 Mar 22 19:50 /tmp/2
> > > -rw-r--r-- 1 root root 5 Mar 22 19:52 /tmp/1
> > >
> > >
> > > -Josh
> > >
> > >
> > > On Tue, Mar 22, 2016 at 7:38 PM, kristau <kristau at gmail.com> wrote:
> > >
> > >> I've always assumed they launched practically simultaneously. Your
> > >> question, however, challenges that assumption.
> > >>
> > >> On Tue, Mar 22, 2016 at 7:30 PM, Patrick Mcgillan
> > >> <patrick.mcgillan at gmail.com> wrote:
> > >> > I have 2 entries in my crontab file like this;
> > >> >
> > >> > * * * * * do something every minute
> > >> > 59 23 * * * do something at 1159PM
> > >> >
> > >> > Qustion is, does cron run both at same time or does it do one and
> then
> > >> the
> > >> > next one.
> > >> >
> > >> > --
> > >> > Patrick
> > >> > _______________________________________________
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> > >>
> > >>
> > >>
> > >> --
> > >> Tired programmer
> > >> Coding late into the night
> > >> The core dump follows
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> >
> >
> >
> > --
> > Tired programmer
> > Coding late into the night
> > The core dump follows
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