[Smaug] A quick scripting puzzle

[Peter Belew]

Right.

On 11/19/05, Anthony Ettinger <apwebdesign at yahoo.com> wrote:
> 1,2?

Yes, the first 2 characters of the line, which might contain a whole
week of dates. So this cuts out the first 2 characters. Example -


$ cal 12 2005|sort -n|tail -1
25 26 27 28 29 30 31

$ cal 12 2005|sort -n|tail -1|cut -c1,2
25

 - Peter
>
> 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/
> > > >
> > > >
> > >
> >
> > _______________________________________________
> > 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
>