[Smaug] A quick scripting puzzle

[Anthony Ettinger]

gcal isn't standard 

--- Thomas Leavitt <thomas at thomasleavitt.org> wrote:

> On Fri, 2005-11-18 at 08:43 -0800,
> smaug-request at lists.svlug.org wrote:
> > Message: 2
> > Date: Thu, 17 Nov 2005 20:26:33 -0800
> > From: Peter Belew <peterbe at sonic.net>
> > Subject: [Smaug] A quick scripting puzzle
> > To: SMAUG Users <smaug at lists.svlug.org>
> > Message-ID: <20051118042633.GA6844 at sonic.net>
> > Content-Type: text/plain; charset=us-ascii
> > 
> > For amusement, create a 1-line sh or bash command
> which will set
> > a shell variable $LASTSUNDAY to the date (2-digit
> day) of the last
> > Sunday in the current month.
> > 
> > Like
> > 
> >    LASTSUNDAY=`some_shell_stuff`
> > 
> > Use only standard Unix utilities such as 'cat' or
> 'head' or 'date'.
> > 
> > The command shouldn't take longer than an
> 80-character line.
> > 
> > (I did this myself for creating a cron job which
> sends out email
> > announcing a meeting on the last sunday of a
> month).
> > 
> > :)
> > 
> >  Peter
> > 
> 
> Here's my entry... I'm pretty sure, somewhere within
> the byzantine array
> of options available in gcal, there's a way to
> directly produce this...
> but I couldn't find it. However, this works, no
> matter whether there are
> four or five Sundays in a month.
> 
> LASTSUNDAY=`gcal -i -s1|tail -n1|sed "s/[
> ]*$//"|rev|cut -b-2|rev`
> 
> I'm not sure how this works, but you could probably
> cheat more, by
> feeding gcal instructions to use some of these
> commands from a file...
> 
> and of course, I'm cheating, by using gcal, but hey.
> :)
> 
> Thomas
> 
> 
> 
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Anthony Ettinger
ph: (408) 656-2473
web: http://www.apwebdesign.com