[ILUG] Bash script misbehaving

[Niall O Broin]

On 20 Aug 2008, at 09:16, Philip Reynolds wrote:\

> going slightly off your original topic, but there's code in your  
> original
> post that looks like it'll be used for testing for the last day of  
> the month
> as well. Hardcoding that might be ok if it wasn't for February 29th  
> (which
> you've accounted for this year, but which obviously needs to be  
> changed in
> the code for next February) ;)
>
> cal(1) can be used to calculate the last day of the current month with
> relative ease.
>
>   /usr/bin/cal | awk '!/^$/{ print $NF }' | tail -1
>
> Simply test that value against
>
>   date +'%d'
>
> Saves hardcoding those things :)

or more elegantly and efficiently, and we're all about elegance and  
efficiency here :-), check for

date -d 'tomorrow' +'%d'

returning 1.

Of course this depends on Gnu date, but this is a Linux mailing list,  
so no apologies there.


Niall