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How do you use the "at" command?

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  How do you use the "at" command? Todd <Todd@invalid.invalid> - 2012-01-27 10:16 -0800
    Re: How do you use the "at" command? Lew Pitcher <lpitcher@teksavvy.com> - 2012-01-27 13:43 -0500
      Re: How do you use the "at" command? Lew Pitcher <lpitcher@teksavvy.com> - 2012-01-27 13:45 -0500
        Re: How do you use the "at" command? Robert Heller <heller@deepsoft.com> - 2012-01-27 15:34 -0600
          Re: How do you use the "at" command? Todd <Todd@invalid.invalid> - 2012-01-27 22:41 -0800
            Re: How do you use the "at" command? Loki Harfagr <l0k1@thedarkdesign.free.fr.INVALID> - 2012-01-28 10:27 +0000
              Re: How do you use the "at" command? Aragorn <stryder@telenet.be.invalid> - 2012-01-28 19:05 +0100
                Re: How do you use the "at" command? Keith Keller <kkeller-usenet@wombat.san-francisco.ca.us> - 2012-01-28 10:26 -0800
                Re: How do you use the "at" command? Loki Harfagr <l0k1@thedarkdesign.free.fr.INVALID> - 2012-01-30 08:51 +0000
                  Re: How do you use the "at" command? Aragorn <stryder@telenet.be.invalid> - 2012-01-31 03:16 +0100
                    Re: How do you use the "at" command? Aragorn <stryder@telenet.be.invalid> - 2012-02-01 00:24 +0100
                      Re: How do you use the "at" command? Robert Heller <heller@deepsoft.com> - 2012-01-31 17:55 -0600
                        Re: How do you use the "at" command? Aragorn <stryder@telenet.be.invalid> - 2012-02-01 02:01 +0100
                          Re: How do you use the "at" command? "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2012-01-31 21:36 -0500
                      Re: How do you use the "at" command? "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2012-01-31 21:25 -0500
                        Re: How do you use the "at" command? Aragorn <stryder@telenet.be.invalid> - 2012-02-01 04:57 +0100
                    Re: How do you use the "at" command? Darren Salt <news@youmustbejoking.demon.cu.invalid> - 2012-01-31 23:46 +0000
                      Re: How do you use the "at" command? Aragorn <stryder@telenet.be.invalid> - 2012-02-01 02:12 +0100
    Re: How do you use the "at" command? Richard Kettlewell <rjk@greenend.org.uk> - 2012-01-27 19:10 +0000
      Re: How do you use the "at" command? Todd <Todd@invalid.invalid> - 2012-01-27 11:17 -0800
        Re: How do you use the "at" command? Robert Heller <heller@deepsoft.com> - 2012-01-27 15:34 -0600
    Re: How do you use the "at" command? unruh <unruh@invalid.ca> - 2012-01-27 20:26 +0000
      Re: How do you use the "at" command? Todd <Todd@invalid.invalid> - 2012-01-27 22:51 -0800
    Re: How do you use the "at" command? Keith Keller <kkeller-usenet@wombat.san-francisco.ca.us> - 2012-01-27 12:23 -0800
      Re: How do you use the "at" command? Robert Heller <heller@deepsoft.com> - 2012-01-27 15:35 -0600
        Re: How do you use the "at" command? Keith Keller <kkeller-usenet@wombat.san-francisco.ca.us> - 2012-01-27 17:22 -0800
          Re: How do you use the "at" command? Robert Heller <heller@deepsoft.com> - 2012-01-27 20:25 -0600
            Re: How do you use the "at" command? Todd <Todd@invalid.invalid> - 2012-01-27 22:49 -0800
              Re: How do you use the "at" command? Bit Twister <BitTwister@mouse-potato.com> - 2012-01-28 07:16 +0000
                Re: How do you use the "at" command? Todd <Todd@invalid.invalid> - 2012-01-27 23:57 -0800
          Re: How do you use the "at" command? Todd <Todd@invalid.invalid> - 2012-01-27 22:49 -0800
            Re: How do you use the "at" command? Robert Heller <heller@deepsoft.com> - 2012-01-28 06:07 -0600
              Re: How do you use the "at" command? Todd <Todd@invalid.invalid> - 2012-01-28 13:32 -0800
                Re: How do you use the "at" command? Robert Heller <heller@deepsoft.com> - 2012-01-28 22:28 -0600
                  Re: How do you use the "at" command? Todd <Todd@invalid.invalid> - 2012-01-28 22:50 -0800
                    Re: How do you use the "at" command? Keith Keller <kkeller-usenet@wombat.san-francisco.ca.us> - 2012-01-28 23:35 -0800
                      Re: How do you use the "at" command? unruh <unruh@invalid.ca> - 2012-01-29 18:46 +0000
                        Re: How do you use the "at" command? Todd <Todd@invalid.invalid> - 2012-01-29 12:03 -0800
                          Re: How do you use the "at" command? Robert Heller <heller@deepsoft.com> - 2012-01-29 15:38 -0600
                            Re: How do you use the "at" command? Todd <Todd@invalid.invalid> - 2012-01-29 16:58 -0800
                          Re: How do you use the "at" command? unruh <unruh@invalid.ca> - 2012-01-30 01:36 +0000
                            Re: How do you use the "at" command? Aragorn <stryder@telenet.be.invalid> - 2012-01-30 03:07 +0100
                              Re: How do you use the "at" command? Todd <Todd@invalid.invalid> - 2012-01-29 19:21 -0800
                            Re: How do you use the "at" command? Todd <Todd@invalid.invalid> - 2012-01-29 19:17 -0800
                      Re: How do you use the "at" command? Todd <Todd@invalid.invalid> - 2012-01-29 11:48 -0800
                    Re: How do you use the "at" command? Robert Heller <heller@deepsoft.com> - 2012-01-29 07:35 -0600
                      Re: How do you use the "at" command? Aragorn <stryder@telenet.be.invalid> - 2012-01-29 20:40 +0100
            Re: How do you use the "at" command? Todd <Todd@invalid.invalid> - 2012-02-03 13:25 -0800
        Re: How do you use the "at" command? Todd <Todd@invalid.invalid> - 2012-01-27 22:45 -0800
      Re: How do you use the "at" command? Todd <Todd@invalid.invalid> - 2012-01-27 22:42 -0800

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#3936

At Fri, 27 Jan 2012 11:17:43 -0800 Todd <Todd@invalid.invalid> wrote:

> 
> On 01/27/2012 11:10 AM, Richard Kettlewell wrote:
> > Todd<Todd@invalid.invalid>  writes:
> >>     Maybe I am a bit dense here, but the man page for "at"
> >> is more than a bit confusing to me.
> >>
> >>     What I want to do is run the follow two commands
> >> as root at a specific time:
> >>
> >>         su root -c "touch /forcefsck; reboot"
> >>
> >>     How do I do that with "at"?
> >
> > Become root first, then run 'at'.
> >
> 
> an example?
>                   

su -l
# at ...
#^D

See my other message for more possibities.


-- 
Robert Heller             -- 978-544-6933 / heller@deepsoft.com
Deepwoods Software        -- http://www.deepsoft.com/
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#3927

On 2012-01-27, Todd <Todd@invalid.invalid> wrote:
> Hi All,
>
>     Maybe I am a bit dense here, but the man page for "at"
> is more than a bit confusing to me.
>
>     What I want to do is run the follow two commands
> as root at a specific time:
>
>         su root -c "touch /forcefsck; reboot"

Well, the problem is that when you do that su to root, you will be asked
for a password. 
However you can su to root right now and then run at as root. 
at 9:45 Jun 14
at> touch /forcefsck; reboot
at>^D

(^D=control D)

>
>     How do I do that with "at"?
>
> Many thanks,
> -T

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#3961

On 01/27/2012 12:26 PM, unruh wrote:
> at 9:45 Jun 14
> at>  touch /forcefsck; reboot
> at>^D

No wonder I did not understand.

Thank you!

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#3928

On 2012-01-27, Todd <Todd@invalid.invalid> wrote:
>
>     What I want to do is run the follow two commands
> as root at a specific time:
>
>         su root -c "touch /forcefsck; reboot"

Is there a particular reason you do not wish to use cron?  Because doing
something at a specific time is easy with cron; I might use at when I
want to say "five minutes from now" but I'd use cron for "11pm every
other night".

--keith


-- 
kkeller-usenet@wombat.san-francisco.ca.us
(try just my userid to email me)
AOLSFAQ=http://www.therockgarden.ca/aolsfaq.txt
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#3935

At Fri, 27 Jan 2012 12:23:54 -0800 Keith Keller <kkeller-usenet@wombat.san-francisco.ca.us> wrote:

> 
> On 2012-01-27, Todd <Todd@invalid.invalid> wrote:
> >
> >     What I want to do is run the follow two commands
> > as root at a specific time:
> >
> >         su root -c "touch /forcefsck; reboot"
> 
> Is there a particular reason you do not wish to use cron?  Because doing
> something at a specific time is easy with cron; I might use at when I
> want to say "five minutes from now" but I'd use cron for "11pm every
> other night".

cron only makes sense for a repeated event or activity.

shutdown itself allows for scheduled shutdowns and has options to force
fsck.  The OP is just wanting to do it 'the (needlessly) hard way'. 
Unless this is some sort of homework program for system admin 101.

> 
> --keith
> 
> 

-- 
Robert Heller             -- 978-544-6933 / heller@deepsoft.com
Deepwoods Software        -- http://www.deepsoft.com/
()  ascii ribbon campaign -- against html e-mail
/\  www.asciiribbon.org   -- against proprietary attachments


         

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#3950

On 2012-01-27, Robert Heller <heller@deepsoft.com> wrote:
> At Fri, 27 Jan 2012 12:23:54 -0800 Keith Keller <kkeller-usenet@wombat.san-francisco.ca.us> wrote:
>
>> 
>> On 2012-01-27, Todd <Todd@invalid.invalid> wrote:
>> >
>> >     What I want to do is run the follow two commands
>> > as root at a specific time:
>> >
>> >         su root -c "touch /forcefsck; reboot"
>> 
>> Is there a particular reason you do not wish to use cron?  Because doing
>> something at a specific time is easy with cron; I might use at when I
>> want to say "five minutes from now" but I'd use cron for "11pm every
>> other night".
>
> cron only makes sense for a repeated event or activity.

The OP did not specify, but I inferred that he wanted to reboot every so
often, in order to force an fsck.  If that's not correct he needs to
clarify.

--keith



-- 
kkeller-usenet@wombat.san-francisco.ca.us
(try just my userid to email me)
AOLSFAQ=http://www.therockgarden.ca/aolsfaq.txt
see X- headers for PGP signature information

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#3953

At Fri, 27 Jan 2012 17:22:41 -0800 Keith Keller <kkeller-usenet@wombat.san-francisco.ca.us> wrote:

> 
> On 2012-01-27, Robert Heller <heller@deepsoft.com> wrote:
> > At Fri, 27 Jan 2012 12:23:54 -0800 Keith Keller <kkeller-usenet@wombat.san-francisco.ca.us> wrote:
> >
> >> 
> >> On 2012-01-27, Todd <Todd@invalid.invalid> wrote:
> >> >
> >> >     What I want to do is run the follow two commands
> >> > as root at a specific time:
> >> >
> >> >         su root -c "touch /forcefsck; reboot"
> >> 
> >> Is there a particular reason you do not wish to use cron?  Because doing
> >> something at a specific time is easy with cron; I might use at when I
> >> want to say "five minutes from now" but I'd use cron for "11pm every
> >> other night".
> >
> > cron only makes sense for a repeated event or activity.
> 
> The OP did not specify, but I inferred that he wanted to reboot every so
> often, in order to force an fsck.  If that's not correct he needs to
> clarify.

*I* assumed that since the OP asked about at, he was looking for a
one-time event.  Maybe he is running some task and wants to schedule a
one time reboot at some time in the future when he is not in front of
the machine or something.

> 
> --keith
> 
> 
> 

-- 
Robert Heller             -- 978-544-6933 / heller@deepsoft.com
Deepwoods Software        -- http://www.deepsoft.com/
()  ascii ribbon campaign -- against html e-mail
/\  www.asciiribbon.org   -- against proprietary attachments


       

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#3960

On 01/27/2012 06:25 PM, Robert Heller wrote:
> *I*  assumed that since the OP asked about at, he was looking for a
> one-time event.  Maybe he is running some task and wants to schedule a
> one time reboot at some time in the future when he is not in front of
> the machine or something.

Yep.  Anyone have an example of how to use "at"?

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#3962

On Fri, 27 Jan 2012 22:49:38 -0800, Todd wrote:
>
> Yep.  Anyone have an example of how to use "at"?


You can put any commands you like in a script and launch it. Example:

at -f aa 00:30                  submits batch job in the morning or
at -f script.ksh now+1minute    for the case where now second is close to 59

For extra points, do a
man at

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#3964

On 01/27/2012 11:16 PM, Bit Twister wrote:
> For extra points, do a
> man at

I did.  No clue what they were trying to say.
That is why I asked.

-T

"Just Google it!".  The new "RTFM".  :'(

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#3959

On 01/27/2012 05:22 PM, Keith Keller wrote:
> The OP did not specify, but I inferred that he wanted to reboot every so
> often, in order to force an fsck.  If that's not correct he needs to
> clarify.

It is for targeted reboots with fsck to get fsck out of the way so
the customer does not have wait around practice his swearing
technique (my name prominently inserted) while he waits for a
long fsck on reboot.

We have a lot of power problems are these parts.  And, some of my 
customers turn their servers off over the weekend.

I mainly use the targeted reboots to clear AHCI failure to mount
issued with removable backup disks.

-T

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#3969

At Fri, 27 Jan 2012 22:49:02 -0800 Todd <Todd@invalid.invalid> wrote:

> 
> On 01/27/2012 05:22 PM, Keith Keller wrote:
> > The OP did not specify, but I inferred that he wanted to reboot every so
> > often, in order to force an fsck.  If that's not correct he needs to
> > clarify.
> 
> It is for targeted reboots with fsck to get fsck out of the way so
> the customer does not have wait around practice his swearing
> technique (my name prominently inserted) while he waits for a
> long fsck on reboot.
> 
> We have a lot of power problems are these parts.  And, some of my 
> customers turn their servers off over the weekend.

It sounds like you need UPSes (and no, I don't mean the people with the
brown trucks).  APC makes a line of linux friendly UPSes and apcupsd is
available in the EPel repository.

> 
> I mainly use the targeted reboots to clear AHCI failure to mount
> issued with removable backup disks.
> 
> -T
>       

-- 
Robert Heller             -- 978-544-6933 / heller@deepsoft.com
Deepwoods Software        -- http://www.deepsoft.com/
()  ascii ribbon campaign -- against html e-mail
/\  www.asciiribbon.org   -- against proprietary attachments


                               

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#3981

On 01/28/2012 04:07 AM, Robert Heller wrote:
> It sounds like you need UPSes (and no, I don't mean the people with the
> brown trucks).  APC makes a line of linux friendly UPSes and apcupsd is
> available in the EPel repository.

I put APC Smart UPS on all my servers.  I install apcupsd to
monitor them.  Problem is that they run down eventually
when the power goes out.  Everything restarts beautifully when
the power comes back on.  Although the guys in the brown
short pants with the brown trucks get a little annoyed  having
to wait around.  They protest that they are delivery guys and not
power guys.  :-)

-T

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#3987

At Sat, 28 Jan 2012 13:32:38 -0800 Todd <Todd@invalid.invalid> wrote:

> 
> On 01/28/2012 04:07 AM, Robert Heller wrote:
> > It sounds like you need UPSes (and no, I don't mean the people with the
> > brown trucks).  APC makes a line of linux friendly UPSes and apcupsd is
> > available in the EPel repository.
> 
> I put APC Smart UPS on all my servers.  I install apcupsd to
> monitor them.  Problem is that they run down eventually
> when the power goes out.  Everything restarts beautifully when
> the power comes back on.  Although the guys in the brown

If you have UPSes and are using apcupsd, it should be performing clean
shutdowns with there is a power failure.  This should avoid the need for
fscks on boot up.

> short pants with the brown trucks get a little annoyed  having
> to wait around.  They protest that they are delivery guys and not
> power guys.  :-)
> 
> -T
>                                                    

-- 
Robert Heller             -- 978-544-6933 / heller@deepsoft.com
Deepwoods Software        -- http://www.deepsoft.com/
()  ascii ribbon campaign -- against html e-mail
/\  www.asciiribbon.org   -- against proprietary attachments


                                                                   

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#3990

On 01/28/2012 08:28 PM, Robert Heller wrote:
> If you have UPSes and are using apcupsd, it should be performing clean
> shutdowns with there is a power failure.  This should avoid the need for
> fscks on boot up.

With RH, you get an fsck every 25 or so reboots.  The reason I do it
on a targeted reboot is to restart the counter so the customer does
not get an fsck in the middle of his work day.  (They have been know
to practice their swearing skills with my name prominently inserted.
Worse case they have been known to flip the power off and back on.)

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#3992

On 2012-01-29, Todd <Todd@invalid.invalid> wrote:
>
> With RH, you get an fsck every 25 or so reboots.

This is changeable or disablable using tune2fs.

> The reason I do it
> on a targeted reboot is to restart the counter so the customer does
> not get an fsck in the middle of his work day.

How often do they reboot?!?  My desktop users (me included) reboot every
few months, so the time-forced fsck generally occurs before the mount
count-forced fsck.  But if they do reboot frequently, you can probably
safely disable the mount-count-forced fsck and rely on the time-forced
one.  You can use a cron job (see, cron's useful!) to touch /forcefsck
and reboot monthly so that your users never hit the time-forced fsck
during their work day.  (If you're on RH you can stick a script into
/etc/cron.monthly/ .)

--keith



-- 
kkeller-usenet@wombat.san-francisco.ca.us
(try just my userid to email me)
AOLSFAQ=http://www.therockgarden.ca/aolsfaq.txt
see X- headers for PGP signature information

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#3999

On 2012-01-29, Keith Keller <kkeller-usenet@wombat.san-francisco.ca.us> wrote:
> On 2012-01-29, Todd <Todd@invalid.invalid> wrote:
>>
>> With RH, you get an fsck every 25 or so reboots.
>
> This is changeable or disablable using tune2fs.
>
>> The reason I do it
>> on a targeted reboot is to restart the counter so the customer does
>> not get an fsck in the middle of his work day.
>
> How often do they reboot?!?  My desktop users (me included) reboot every
> few months, so the time-forced fsck generally occurs before the mount
> count-forced fsck.  But if they do reboot frequently, you can probably
> safely disable the mount-count-forced fsck and rely on the time-forced
> one.  You can use a cron job (see, cron's useful!) to touch /forcefsck
> and reboot monthly so that your users never hit the time-forced fsck
> during their work day.  (If you're on RH you can stick a script into
> /etc/cron.monthly/ .)

In order to save power, many businesses request that you shut down every
day when you go home. 50 machines in an office all drawing 100 watts of
power every night equals .1 MWhr of power useage. That is not
negligible, in terms of energy savings, even if not money savings.


>
> --keith
>
>
>

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#4005

On 01/29/2012 10:46 AM, unruh wrote:
> n order to save power, many businesses request that you shut down every
> day when you go home. 50 machines in an office all drawing 100 watts of
> power every night equals .1 MWhr of power useage. That is not
> negligible, in terms of energy savings, even if not money savings.

I tell my customers to figure about $300.00 per year in extra
electricity to leave their computers on 24/7.  You also wear
out your computers sooner leaving them on all the time.

One of my good customers turns his server off over the weekend.
He does not get upset over a fsck either.  Come to think of
it, his AHCI removable hard drives always mount correctly
as well, when he changes them out.

-T

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#4007

At Sun, 29 Jan 2012 12:03:50 -0800 Todd <Todd@invalid.invalid> wrote:

> 
> On 01/29/2012 10:46 AM, unruh wrote:
> > n order to save power, many businesses request that you shut down every
> > day when you go home. 50 machines in an office all drawing 100 watts of
> > power every night equals .1 MWhr of power useage. That is not
> > negligible, in terms of energy savings, even if not money savings.
> 
> I tell my customers to figure about $300.00 per year in extra
> electricity to leave their computers on 24/7.  You also wear
> out your computers sooner leaving them on all the time.
> 
> One of my good customers turns his server off over the weekend.

Not necessarily a good thing, depending on the use cases.

> He does not get upset over a fsck either.  Come to think of
> it, his AHCI removable hard drives always mount correctly
> as well, when he changes them out.

I bet he properly does an 'umount' before removing them...

It might also be the make, model, and vintage of the SATA controllers
in question.  Some of the early model SATA controllers did not handle
AHCI hot-swapping right.

> 
> -T
>                                                   

-- 
Robert Heller             -- 978-544-6933 / heller@deepsoft.com
Deepwoods Software        -- http://www.deepsoft.com/
()  ascii ribbon campaign -- against html e-mail
/\  www.asciiribbon.org   -- against proprietary attachments


        

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#4010

On 01/29/2012 01:38 PM, Robert Heller wrote:
> It might also be the make, model, and vintage of the SATA controllers
> in question.  Some of the early model SATA controllers did not handle
> AHCI hot-swapping right.

I think bios revisions may have something to do with it too.

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