Re: Crontab last days of the month..

[Rick Pasotto <rick@niof.net>]

On Wed, Apr 14, 2004 at 09:58:38AM -0600, s. keeling wrote:
> Incoming from Wayne Topa:
> > Rus Foster(rghf@fsck.me.uk) is reported to have said:
> > > Hi All,
> > > Couldn't find a decent answer to this in google but goes as follows
> > > 
> > > If I have a cron job that is scheduled for the 31st of the month and the
> > > month we are in doesn't have 31 days would it be run on the last day of
> > > the month or not run at all?
> > 
> > I bzip up all my mail at the end of the month and had the same
> > problem.  I solved it by having the script run 1 minute after midnight
> > on the 1st of the month.
> 
> Another way is to run it every day, but have the script figure out if
> it's the last day of the month, and exit if not.  I have no idea where
> I found this, nor have I tested it extensively:
> 
> days_in_month () 
> { 
>     dim_m=${1:-`date +%m`};
>     dim_m=`monthnum $dim_m`;
>     case ${dim_m#0} in 
>         9 | 4 | 6 | 11)
>             echo 30
>         ;;
>         1 | 3 | 5 | 7 | 8 | 10 | 12)
>             echo 31
>         ;;
>         2)
>             is_leap_year ${2:-`date +%Y`} && echo 29 || echo 28
>         ;;
>     esac
> }

if [ $(date -d tomorrow '+%m') -ne $(date '+%m') ]
then
	echo 'today is the last day of the month'
fi


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 calculation, and without meaningful economic calculation,
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    Rick Pasotto    rick@niof.net    http://www.niof.net