RE: bash date math

[rick henderson <rick henderson wsdtx org>]

Great Stuff.  Thanks so much.  I would never have got that from the man
pages.

Rick

On Thu, 2003-07-31 at 09:59, Ward William E DLDN wrote:
> 
> 
> > -----Original Message-----
> > From: Hal Burgiss [mailto:hal foobox net]
> > Sent: Thursday, July 31, 2003 10:50 AM
> > To: redhat
> > Subject: Re: bash date math
> > 
> > 
> > On Thu, Jul 31, 2003 at 09:45:55AM -0500, rick henderson wrote:
> > > In a bash script, I need to know the previous day.
> > > 
> > > if 03012003 then 02282003
> > > if 05012003 then 04302003
> > > if 08012003 then 07312003
> > > 
> > > using date, I can get todays date.  But I need date math.
> > 
> > $ date -d "-1 day"
> > Wed Jul 30 10:48:46 EDT 2003
> > 
> > ???
> 
> I'll take it even further:
> 
> $date -d "-1 day" +%m%d%Y
> 07302003
> 
> Even more:
> 
> $date -d "-3 days -1 month" +%m%d%Y
> 06282003
> 
> So, as Hal so eloquently put it ???
> 
> Bill Ward
> 
> 
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