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Groups > comp.os.linux.misc > #1328

Re: at syntax

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On Fri, 03 Jun 2011 09:34:14 +0100, Chris Davies wrote:

> Dave Gibson <dave.gma+news002@googlemail.com.invalid> wrote:
>>  $ date
>>  Thu Jun  2 22:13:12 BST 2011
>>  $ echo "echo hello" | at 11:30pm thursday job 638 at Thu Jun  9
>>  23:30:00 2011
> 
> Thank you for the counter example. And I presume that because (when you
> ran this) it was Thursday, and the time was in the future, you expected
> "at" to schedule it for that same day. Personally, I don't think I'd
> expect that (think about the semantics of English: "can you book me into
> a hotel on Friday, please" implies *next* Friday rather than today).
> However, I believe I now see what the OP is getting at.
> 
> So, some suggestions for the OP:
> 
> * Use a construct like this one (below) to determine what "today's" DoW
> (Day of week) is:
>     TODAY=$(date +%A | tr '[:upper:]' '[:lower:]')
> 
> * Remove the DoW specification for "at" entirely for the current date
>     test "$TODAY" = "$DOW" && DOW=
> 
> * Replace the DoW specification to "at" with "today" as appropriate
>     test "$TODAY" = "$DOW" && DOW='today'
> 
> * Avoid using DoW at all and use absolute dates
> 
> Chris

Absolute dates don't work, it's for general purpose scripts which are 
going to be used for a long time. The person that I've written the scripts 
for wants to be able to schedule the capture of a TV show on a demand 
basis, which means that she might run the script on the same day as the 
show as well as running it in advance. Apparently at has no way of 
distinguishing between THIS MONDAY and NEXT MONDAY. I've written a wrapper 
for at called schedule_event which fixes the problem

#!/bin/csh -f
set path=(/usr/local/bin /usr/local/sbin /usr/bin /sbin /usr/sbin /bin /
usr/X11R6/bin /usr/local/csh)


if(`date +%a` == $3) then
 echo at $1 $2 TODAY < /usr/local/csh/$4.csh
 at $1 $2 TODAY < /usr/local/csh/$4.csh
else
 echo at $1 $2 $3 < /usr/local/csh/$4.csh
 at $1 $2 $3 < /usr/local/csh/$4.csh
endif

The line in the script that does the scheduling then looks like

schedule_event 8:00 PM Thu big_bang

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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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