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Groups > comp.os.linux.misc > #1288

Re: at syntax

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General Schvantzkoph <schvantzkoph@yahoo.com> wrote:
> at adds a week to a day if the day is today.

Not necessarily:

    chris:~$ date
    Tue May 31 09:32:06 BST 2011

    chris:~$ at 10am today
    warning: commands will be executed using /bin/sh
    at> date >/tmp/1.at
    at> <EOT>
    job 794 at Tue May 31 10:00:00 2011

    chris:~$ at 9am today
    at: refusing to create job destined in the past

    chris:~$ at 10am
    warning: commands will be executed using /bin/sh
    at> date >/tmp/2.at
    at> <EOT>
    job 795 at Tue May 31 10:00:00 2011

    chris:~$ at 9am
    warning: commands will be executed using /bin/sh
    at> date >/tmp/3.at
    at> <EOT>
    job 796 at Wed Jun  1 09:00:00 2011

The "today" modifier forces the date parser to use today's date. If the
time has passed then the job cannot be queued. If you omit the "today"
modifier, the at program tries to make sense of what you're requesting,
and if the time is earlier than "now", it assumes you meant tomorrow.

This sort of interpretation can be great for humans, but potentially
very complex for other programs to use correctly. Fortunately, at also
provides an absolute date/time specification:

    chris:~$ at 13:45 utc 10 jun 2011
    warning: commands will be executed using /bin/sh
    at> date >/tmp/4.at
    at> <EOT>
    job 797 at Fri Jun 10 13:45:00 2011

Unfortunately, it looks like this version of at may not honour the
timezone parameter (I need to check this further).

Chris

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Thread

at syntax General Schvantzkoph <schvantzkoph@yahoo.com> - 2011-05-30 18:08 +0000
  Re: at syntax Lew Pitcher <lpitcher@teksavvy.com> - 2011-05-30 16:04 -0400
    Re: at syntax General Schvantzkoph <schvantzkoph@yahoo.com> - 2011-05-30 23:16 +0000
  Re: at syntax Chris Davies <chris-usenet@roaima.co.uk> - 2011-05-31 09:44 +0100
    Re: at syntax General Schvantzkoph <schvantzkoph@yahoo.com> - 2011-05-31 12:37 +0000
      Re: at syntax Chris Davies <chris-usenet@roaima.co.uk> - 2011-05-31 14:54 +0100
        Re: at syntax General Schvantzkoph <schvantzkoph@yahoo.com> - 2011-05-31 18:52 +0000
          Re: at syntax Chris Davies <chris-usenet@roaima.co.uk> - 2011-06-02 21:03 +0100
            Re: at syntax dave.gma+news002@googlemail.com.invalid (Dave Gibson) - 2011-06-02 22:24 +0100
              Re: at syntax Chris Davies <chris-usenet@roaima.co.uk> - 2011-06-03 09:34 +0100
                Re: at syntax General Schvantzkoph <schvantzkoph@yahoo.com> - 2011-06-03 13:21 +0000
                Re: at syntax Chris Davies <chris-usenet@roaima.co.uk> - 2011-06-03 15:46 +0100
  Re: at syntax Kevin Snodgrass <kdsnodgrass@yahoo.com> - 2011-06-01 02:08 +0000
    Re: at syntax General Schvantzkoph <schvantzkoph@yahoo.com> - 2011-06-01 02:50 +0000
      Re: at syntax Kevin Snodgrass <kdsnodgrass@yahoo.com> - 2011-06-01 04:30 +0000
      Re: at syntax Kevin Snodgrass <kdsnodgrass@yahoo.com> - 2011-06-01 04:31 +0000
      Re: at syntax Kevin Snodgrass <kdsnodgrass@yahoo.com> - 2011-06-01 04:31 +0000
      Re: at syntax Kevin Snodgrass <kdsnodgrass@yahoo.com> - 2011-06-01 04:30 +0000

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