[Smaug] A quick scripting puzzle

[Anthony Ettinger]

1,2?

Last Sunday will always be two digits.

--- Peter Belew <abcruzww at gmail.com> wrote:

> Ok, it's been a couple of days - my solution is
> 
> LASTSUNDAY=`cal|sort -n|tail -1|cut -c1,2`
> 
> So my "Calendar Act' test script is
> 
> $ for x in 1 2 3 4 5 6 7 8 9 10 11 12; do
> > LASTSUNDAY=`cal $x 1752|sort -n|tail -1|cut -c1,2`
> > echo $x - $LASTSUNDAY
> > done
> $ cal 1752
> 
> Thanks again to James for suggesting 'sort' (though
> I added the
> -n to make it work right). 'sort' gets rid of the
> blank lines at the end.
> 'grep [0-9]' will work for that too (Thanks Cerise
> for that).
> 
> - Peter
> 
> On 11/19/05, Peter Belew <abcruzww at gmail.com> wrote:
> > Among the commands various people (including
> myself) have
> > used, 'cal' and 'colrm' are BSD in origin. 'cal'
> seems to be
> > universal (UNIX-versal?) anyway, but apparently
> some solari don't
> > have 'colrm'. On Linux (Fedora Core 1 on this
> system):
> >
> > HISTORY
> >      The colrm command appeared in 3.0BSD.
> >
> > Hmm ... cal in Linux has a BSD heritage, but
> apparently there's
> > an earlier cal from AT&T:
> >
> > HISTORY
> >      A cal command appeared in Version 6 AT&T
> UNIX.
> >
> > 'colrm' does not exist on  SCO UNIX 5.0.6
> (deepthought.armory.com);
> > the same system's 'cal' claims to be
> standards-compliant.
> >
> > My algorithm does work on deepthought, though. My
> favorite
> > test is like
> >
> >  for x in 1 2 3 4 5 6 7 8 9 10 11 12; do
> > > LAST=`cal $x 1752 | rest-of-my-algorithm`
> > > echo $x - $LAST;
> > > done
> >
> > After which I do 'cal 1752' to compare the dates
> calculated with
> > the whole calendar for that year (worst-case
> test).
> >
> > - Peter
> >
> > On 11/19/05, Anthony Ettinger
> <apwebdesign at yahoo.com> wrote:
> > > 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
> > > >
> > > >
> > > >
> > > >
> _______________________________________________
> > > > Smaug mailing list
> > > > Smaug at lists.svlug.org
> > > > http://lists.svlug.org/lists/listinfo/smaug
> > > > Smaug home page: http://www.scruz.org/
> > > >
> > >
> > >
> > > Anthony Ettinger
> > > ph: (408) 656-2473
> > > web: http://www.apwebdesign.com
> > >
> > > _______________________________________________
> > > Smaug mailing list
> > > Smaug at lists.svlug.org
> > > http://lists.svlug.org/lists/listinfo/smaug
> > > Smaug home page: http://www.scruz.org/
> > >
> > >
> >
> 
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> 


Anthony Ettinger
ph: (408) 656-2473
web: http://www.apwebdesign.com